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                    </div>
                    <br style="clear: both" />
            
                    <div class="SiteHeaderRow">
                        <ul class="SiteHeaderRightLink">
                            <li class="SiteHeaderPanelLink"><a href="/products/catalog.html?promoid=JOOTH" id="Products_Seeallproducts">See all products</a></li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shBusinessSolutions">
                <a href="/solutions.html?promoid=KAWQJ" id="shBusinessSolutionsLink" class="SiteHeaderBarLink">Business solutions</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Double" id="BusinessSolutionsPanel">
                    <div class="SiteHeaderRow">
                        <div class="SiteHeaderColumn-1">
                            <p class="SiteHeaderPanelHeaderSmall">By business need</p>
                            <ul>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/digital-analytics.html?promoid=JOLJB" id="BusinessSolutions_Bybusinessneed_Digitalanalytics">Digital analytics</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/digital-publishing.html?promoid=JOLJA" id="BusinessSolutions_Bybusinessneed_Digitalpublishing">Digital publishing</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/products/acrobat.html?promoid=KAWSC" id="BusinessSolutions_Bybusinessneed_Documentmanagement">Document management</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/media-optimization.html?promoid=JOLIX" id="BusinessSolutions_Bybusinessneed_Mediaoptimization">Media optimization</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/social-marketing.html?promoid=JZPNO" id="BusinessSolutions_Bybusinessneed_Socialmarketing">Social marketing</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/testing-targeting.html?promoid=KAXLU" id="BusinessSolutions_Bybusinessneed_Testingandtargeting">Testing and targeting</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/products/creativecloud/video.html?promoid=KAUDD" id="BusinessSolutions_Bybusinessneed_Videoeditingandserving">Video editing and serving</a></li>
                                <li class="SiteHeaderPanelLink"><a href="http://html.adobe.com?promoid=JZEFF" target="_blank" class="SiteHeaderLinkNewWindow" id="BusinessSolutions_Bybusinessneed_Webdevelopment">Web <span class="SiteHeaderIconNewWindowNoWrap">development<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/web-experience-management.html?promoid=JOOYM" id="BusinessSolutions_Bybusinessneed_Webexperiencemanagement">Web experience management</a></li>
                            </ul>
            
                            <ul class="SiteHeaderPanelLinkNoBottom">
                                <li class="SiteHeaderPanelLink"><a href="/solutions.html?promoid=JOOTI" id="BusinessSolutions_Seeallbusinessneeds">See all business needs</a></li>
                            </ul>
                         </div>
            
                        <div class="SiteHeaderColumn-2">
                            <p class="SiteHeaderPanelHeaderSmall">By industry</p>
                            <ul>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/broadcasting.html?promoid=JOLIY" id="BusinessSolutions_Byindustry_Broadcast">Broadcast</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/education.html?marketSegment=EDU&promoid=JOLIZ" id="BusinessSolutions_Byindustry_Education">Education</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/financial-services.html?promoid=KAUDE" id="BusinessSolutions_Byindustry_Financialservices">Financial services</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/government.html?promoid=KAUDF" id="BusinessSolutions_Byindustry_Government">Government</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/digital-publishing.html?promoid=KAUDG" id="BusinessSolutions_Byindustry_Publishing">Publishing</a></li>
                                <li class="SiteHeaderPanelLink"><a href="/solutions/retail.html?promoid=KAWSD" id="BusinessSolutions_Byindustry_Retail">Retail</a></li>
                            </ul>
            
                            <ul class="SiteHeaderPanelLinkNoBottom">
                                <li class="SiteHeaderPanelLink"><a href="/solutions.html?promoid=KAUDH" id="BusinessSolutions_Seeallindustries">See all industries</a></li>
                            </ul>
                        </div>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shSupportLearning">
                <a href="http://helpx.adobe.com/support/?promoid=KAWQK" id="shSupportLearningLink" class="SiteHeaderBarLink">Support &amp; Learning</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="SupportLearningPanel">
                    <div class="SiteHeaderRow">
                        <p class="SiteHeaderPanelHeaderSmall">I need help</p>
                        <ul>
                            <li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/support/?promoid=JZEFP" id="SupportLearning_Ineedhelp_Products">Products</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/creative-cloud/topics/getting-started.html?promoid=JZEFO" id="SupportLearning_Ineedhelp_AdobeCreativeCloud">Adobe Creative Cloud</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/marketing-cloud.html?promoid=KAWSE" id="SupportLearning_Ineedhelp_AdobeMarketingCloud">Adobe Marketing Cloud</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://forums.adobe.com/index.jspa?promoid=JZEFM" target="_blank" id="SupportLearning_Ineedhelp_Forums"><span class="SiteHeaderIconNewWindowNoWrap">Forums<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                        </ul>
            
                        <p class="SiteHeaderPanelHeaderSmall">I want to learn</p>
                        <ul class="SiteHeaderPanelLinkNoBottom">
                            <li class="SiteHeaderPanelLink"><a href="http://helpx.adobe.com/learning.html?promoid=KAUDK" id="SupportLearning_Iwanttolearn_Trainingandtutorials">Training and tutorials</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://training.adobe.com/certification.html?promoid=KAUDM" target="_blank" id="SupportLearning_Iwanttolearn_Certification"><span class="SiteHeaderIconNewWindowNoWrap">Certification<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                            <li class="SiteHeaderPanelLink"><a href="/devnet.html?promoid=KAUDN" id="SupportLearning_Iwanttolearn_AdobeDeveloperConnection">Adobe Developer Connection</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/designcenter.html?promoid=KAUDO" id="SupportLearning_Iwanttolearn_AdobeDesignCenter">Adobe Design Center</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://tv.adobe.com?promoid=KFELF" target="_blank" id="SupportLearning_Iwanttolearn_AdobeTV">Adobe <span class="SiteHeaderIconNewWindowNoWrap">TV<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                            <li class="SiteHeaderPanelLink"><a href="/solutions/digital-marketing/guides.html?promoid=KAWSF" id="SupportLearning_Iwanttolearn_AdobeMarketingCenter">Adobe Marketing Center</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://labs.adobe.com/?promoid=JZEFQ" target="_blank" id="SupportLearning_Iwanttolearn_AdobeLabs">Adobe <span class="SiteHeaderIconNewWindowNoWrap">Labs<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shDownload">
                <a href="/downloads/?promoid=KAWQL" id="shDownloadLink" class="SiteHeaderBarLink">Download</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="DownloadPanel">
                    <div class="SiteHeaderRow">
                        <ul>
                            <li class="SiteHeaderPanelLink"><a href="/downloads/?promoid=JZEFS" id="Download_Producttrials">Product trials</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/flashplayer/?promoid=JZEFT" id="Download_AdobeFlashPlayer">Adobe Flash Player</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/reader/?promoid=JZEFU" id="Download_AdobeReader">Adobe Reader</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://get.adobe.com/air/?promoid=JZEFV" id="Download_AdobeAIR">Adobe AIR</a></li>
                        </ul>
            
                        <ul class="SiteHeaderPanelLinkNoBottom">
                            <li class="SiteHeaderPanelLink"><a href="/downloads/?promoid=JZEFW" id="Download_Seealldownloads">See all downloads</a></li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shCompany">
                <a href="/company.html?promoid=KAWQM" id="shCompanyLink" class="SiteHeaderBarLink">Company</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="CompanyPanel">
                    <div class="SiteHeaderRow">
                        <ul>
                            <li class="SiteHeaderPanelLink"><a href="/careers.html?promoid=JZEFX" id="Company_CareersatAdobe">Careers at Adobe</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/aboutadobe/invrelations/?promoid=JZEFZ" id="Company_InvestorRelations">Investor Relations</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/aboutadobe/pressroom/?promoid=JZEGA" id="Company_Newsroom">Newsroom</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/privacy.html?promoid=JZEGB" id="Company_Privacy">Privacy</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/corporate-responsibility.html?promoid=JZEFY" id="Company_CorporateResponsibility">Corporate Responsibility</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/customershowcase.html?promoid=KEWBG" id="Company_CustomerShowcase">Customer Showcase</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/company/contact.html?promoid=JZEGC" id="Company_Contactus">Contact us</a></li>
                        </ul>
            
                        <ul class="SiteHeaderPanelLinkNoBottom">
                            <li class="SiteHeaderPanelLink"><a href="/company.html?promoid=JZPLK" id="Company_Morecompanyinfo">More company info</a></li>
                        </ul>
                    </div>
                </div>
            </div>
            <div class="SiteHeaderDropdownLink SiteHeaderBarItem" id="shBuy">
                <a href="/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_software_sl_mostpopular.html?promoid=KAWQN" id="shBuyLink" class="SiteHeaderBarLink">Buy</a>
                <div class="SiteHeaderDropPanel SiteHeaderDropdown-Single" id="BuyPanel">
                    <div class="SiteHeaderRow">
                        <ul class="SiteHeaderPanelLinkNoBottom">
                            <li class="SiteHeaderPanelLink"><a href="/products/catalog/software.html?marketSegment=COM&promoid=KAWQO" id="Buy_Forpersonalandprofessionaluse">For personal and professional use</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/products/catalog/software._sl_id-contentfilter_sl_catalog_sl_education_sl_alledu.html?marketSegment=EDU&promoid=KAWQP" id="Buy_Forstudentseducatorsandstaff">For students, educators, and staff</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/products/small-business-pricing/software-catalog._sl_id-contentfilter_sl_catalog_sl_software_sl_creativecloudmembership.html?marketSegment=COM&promoid=JOLJE" id="Buy_Forsmallandmediumbusinesses">For small and medium businesses</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/volume-licensing.html?promoid=KAWQQ" id="Buy_VolumeLicensing">Volume Licensing</a></li>
                            <li class="SiteHeaderPanelLink"><a href="/products/discount-software-coupons.html?promoid=KAWQR" id="Buy_Specialoffers">Special offers</a></li>
                            <li class="SiteHeaderPanelLink"><a href="http://success.adobe.com/en/na/programs/rfi/dm_sales_inquiries.html?promoid=KAWSG" target="_blank" id="Buy_AdobeMarketingCloudsales">Adobe Marketing Cloud <span class="SiteHeaderIconNewWindowNoWrap">sales<span class="SiteHeaderIconNewWindow"> [opens in a new window]</span></span></a></li>
                        </ul>
                    </div>
                </div>
            </div>

			<!--
            <div id="tooltipStrings" class="SiteHeaderTooltipStrings LayoutHidden">
                <span id="tooltipStringExpandMenu">Expand menu</span>
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            <a href="/go/gnav_search" id="shSearchButton" class="SiteHeaderBarItem SiteHeaderSearchButton" style="display: none;">Search</a>
            <div class="SiteHeaderBarItem SiteHeaderBarItemLast">&nbsp;</div>
            <div id="site-search" class="SiteHeaderSearch">
                <input title="Search" type="text" id="search-input" name="term" maxlength="1000" />
                <input type="hidden" id="searchbuddy-loc" name="loc" value="en_us" />
                <button type="submit" id="search-submit" class="icon-replace search">Search</button>
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        </div>
        <div class="SiteHeaderUser">
            <div id="shSignInBlock">
                <a id="shInfo" class="SiteHeaderUserItem SiteHeaderInfo">Info</a>
                <a href="/account/sign-in.adobedotcom.html" id="shSignIn" class="SiteHeaderUserItem LinkStrong">Sign in</a>
                <div class="SiteHeaderPopPanelShadow width-250" id="InfoPanelShadow" style="display: none;"></div>
                <div class="SiteHeaderPopPanel width-250" id="InfoPanel" style="display: none;">
                    <div class="SiteHeaderPanelRow">
                        <span class="SiteHeaderPanelHeader">Why sign in?</span>
                        Sign in to manage your account and access trial downloads, product extensions, community areas, and more.
                    </div>
                </div>
            </div>
        
            <a href="/account.html" id="shWelcome" class="SiteHeaderUserItem SiteHeaderArrow LinkStrong" style="display: none;">Welcome, <span id="screenName"></span></a>
        
            <div class="SiteHeaderPopPanelShadow" id="WelcomePanelShadow" style="display: none;"></div>
            <div class="SiteHeaderPopPanel" id="WelcomePanel" style="display: none;">
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyAccount">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_en_us">My Adobe</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyOrders">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myorders_en_us">My orders</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyInformation">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myinformation_en_us">My information</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyPreferences">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_mypreferences_en_us">My preferences</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shMyProductsServices">
                    <a class="SiteHeaderPanelHeader" href="/go/gnavtray_myadobe_myproducts_services_en_us">My products and services</a>
                </div>
                <div class="SiteHeaderPanelRow SiteHeaderPanelLink" id="shSignOut">
                    <a class="SiteHeaderPanelHeader" id="shSignOutLink" href="/cfusion/membership/logout.cfm">Sign out</a>
                </div>
            </div>
        
            <div id="MyCartLinkContainer">
                <a href="/go/gnav_mycart_en_us" id="shMyCart" class="SiteHeaderUserItem SiteHeaderCart">My cart<span id="cartQuantity"></span></a>
            </div>
        
            <a href="/privacy.html" id="shPrivacy" class="SiteHeaderUserItem">Privacy</a>
            <a href="/go/gnav_myadobe_en_us" id="shMyAdobe" class="SiteHeaderUserItem">My Adobe</a>
        </div>
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<div id="SiteHeaderMobile" class="SiteHeaderMobile LayoutHidden LayoutSlim Text TextSmall">
    <a href="/go/gnav_adobe_logo_en_us" id="shHomeMobile" class="SiteHeaderHome SiteHeaderHomeMobile">Adobe</a>

    <div class="SiteHeaderBar SiteHeaderBarMobile" id="shBarMobile">
        <span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoLeftBorder" id="shProductsMobileSpan"><a href="/go/gnav_products_en_us" id="shProductsMobile" class="SiteHeaderBarLink">Products</a></span>
        <span class="SiteHeaderBarItemMobile" id="shSectionsMobileSpan"><a href="#" id="shSectionsMobile" class="SiteHeaderArrowMobile SiteHeaderBarLink">Sections</a></span>
        <span class="SiteHeaderBarItemMobile" id="shSectionsMobileBuy"><a href="/go/gnav_store_en_us" id="shBuyMobile" class="SiteHeaderBarLink">Buy</a></span>
        <span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoRightBorder SiteHeaderBarItemMobileNoPadding">&nbsp;</span>
        <span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoRightBorder SiteHeaderBarItemFloatRight" id="shSearchMobileSpan"><a href="/go/gnav_search" id="shSearchMobile" class="SiteHeaderSearchButtonMobile">Search</a></span>
        <span class="SiteHeaderBarItemMobile SiteHeaderBarItemMobileNoLeftBorder SiteHeaderBarItemFloatRight SiteHeaderBarItemMobileNoPadding">&nbsp;</span>
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    <div class="SiteHeaderBarMobileExtend" id="shBarExtend">
        <div id="shBarExtendSections" style="display: none;">
            <div id="shBarExtendSections1" class="SiteHeaderBarMobileExtendSections">
                <a href="/go/gnav_solutions_en_us" id="shSectionsSolutionsMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Solutions</a>
                <a href="/go/gnav_company_en_us" id="shSectionsCompanyMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Company</a>
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            <div id="shBarExtendSections2" class="SiteHeaderBarMobileExtendSections">
                <a href="/go/gnav_help_en_us" id="shSectionsHelpMobile" class="SiteHeaderBarExtendSectionsItem SiteHeaderBarLink">Help</a>
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        <div id="shBarExtendSearch" style="display: none;">
            <form id="globalnav-search-mobile" class="SiteHeaderSearchMobileForm" name="globalnav-search-mobile" method="get" action="/go/gnav_search" accept-charset="utf-8">
                <input title="Search" type="text" id="search-input-mobile" name="term" maxlength="1000" />
                <button type="submit" id="search-submit-mobile">Search</button>
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    <div class="SiteHeaderUser">
        <a href="/cfusion/membership/index.cfm?loc=en_us&amp;nl=1" id="shSignInMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile LinkStrong">Sign in</a>
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        <a href="/privacy.html" id="shPrivacyMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile">Privacy</a>
        <a href="/go/gnav_myadobe_en_us" id="shMyAdobeMobile" class="SiteHeaderUserItem SiteHeaderUserItemMobile">My Adobe</a>
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							<div style="float:left;width:100%" class="CPodCostCell">
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                                <span id="HoverCartPreOrderHardGoodMsgxyz" style="display:none;" class="TextWarning TextPostScript">Preorder Estimated Availability <span id="HoverCartPreOrderHardGoodMsgDatexyz">Date</span>. Your credit card will not be charged until the product is shipped. Estimated availability date is subject to change.</span>
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				<div class="HoverCartEDUMessage LayoutBigCellBottom" style="display:none">Purchase requires verification of academic eligibility</div>
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                        <td>
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                        <td>
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                        <td>
                            <div class="LayoutRight TextRight">
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				<div class="LayoutBreak"></div>		
				
				<div class="HoverCart-1-3 LayoutRight LayoutCellTop LayoutBreakAfter">
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		</div>
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<script>
	/*global jQuery,adobe*/
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		DisplayTime: "5000",

		MoreItemsTextSingular: "() more item in your cart",

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		YearlyText: "per year"
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		AkamaiURLPrefix: 		"http://wwwimages.adobe.com/www.adobe.com",

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		SubYearText:			"Annual",

		SubscriptionItemText:	"NONE",

		TermTypeMonth:			"MONTH",

		TermTypeYear:			"YEAR",

		BackupDVDParent:		"_PARENT",
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						<p>The Flex 4 release is a major change from Flex 3. Flex 4 introduces a new component and skinning architecture. As a Flex 3 developer, however, you will likely not encounter too many challenges when compiling Flex 3 applications with Flex 4 , since a goal of the new release is to maintain backwards compatibility with Flex 3.</p>
<p>In this article, I will provide a general overview of the main objectives in Flex 4, architecture differences, and an introduction to changes in components, layouts, use of states, and effects. I'll also answer some questions regarding what to expect when you compile your Flex 3 application in Flex 4. This article will not cover all of the new features and functionality in Flex 4. For that information, read the article <a href="/devnet/flex/articles/flex4sdk_whatsnew.html">What's new in Flex 4</a>.</p>
<p>Throughout this document, the term MX components refers to components originally included in Flex 3. The term Spark components refers to the new set of components in Flex 4.</p>
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        Migrating applications to Flex 4 </h3>
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						<p>When migrating Flex 3 applications to Flex 4, you should not expect to do very much work. Other than bug fixes and a change in the default theme, you can look forward to your application generally working the same (or better) than it did in Flex 3. However, there are a few things to watch out for.</p>
<h4>Player dependency</h4>
<p>Be sure that you compile against Flash Player 10. The Flex 4 SDK requires Flash Player 10 support.</p>
<h4>Type selectors require a namespace</h4>
<p>A CSS type selector names the Flex class to style. For example, the following are type selectors for Button and DateField:</p>
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}
DateField {
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						<p>As of the Flex 4 SDK, when an application uses type selectors, a namespace is required. If you are using only the MXML 2006 namespace in your Flex Application, add the following default namespace declaration to your CSS:</p>
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@namespace &#034;http://www.adobe.com/2006/mxml&#034;;
…
&lt;/mx:Style&gt;</code>
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						<p>If you are using multiple namespaces in your application, then you will need to provide each of the namespaces in your CSS. For an example, see <a href="/devnet/flex/articles/flex3and4_differences.html#_Namespaces_and_packages">Namespaces and packages in Flex 4</a> later in this article.</p>
<p>Further, if an application used a method like StyleManager.getStyleDeclaration(&quot;Button&quot;), the type selector will need to include its package. For example, the call to getStyleDeclaration() would change to StyleManager.getStyleDeclaration(&quot;mx.controls.Button&quot;).</p>
<h4>Theme change</h4>
<p>The default theme for Flex 3 (MX) components is now the Spark theme. Therefore, your application may look and size itself differently when you compile it using the Flex 4 SDK. If, however, you want to use the Flex 3 look you still can because Flex 4 includes the Halo theme from Flex 3. To compile using the Halo theme, you can use the additional compiler argument -compatibility-version=3.0. In Flash Builder 4, you can do this in the Properties Panel. In the Properties Panel, select, Flex Compiler and click the checkbox for “Use Flex 3 compatibility mode&quot; (see Figure 1).</p>
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        Figure 1. Using Flex 3 Compatibility Mode </div>
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						<p>Alternatively, the theme can be changed from the default Spark theme to Halo in the Properties -&gt; Flex Theme panel. In the “Flex Theme” panel, click on the Halo theme (see Figure 2).</p>
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        Figure 2. Selecting the Halo Theme in the Properties Panel </div>
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						<p>If you do choose to use the new Spark theme, note that many              of the styles that worked with the Halo theme do not work in the Spark theme.              The Spark theme only supports a limited number of styles.              To understand which styles are available for the Spark skin, you should reference the ASDoc. For each style listed per component, a &quot;Theme&quot; will be designated. If no theme is designated, then, the style is available for both the Halo and Spark theme. Flex 4  has also added a              Wireframe skin that was designed to be used for quick mock-ups. The wireframe theme does not support style changes.</p>
            <p>In addition to the theme change, the default preloader has              changed to the mx.preloaders.SparkDownloadProgressBar for Flex 4               applications. This lighter weight preloader should shorten start-up time a little.              If you want to use the Flex 3 preloader, you only need to change one line of              code. In your <code>Application</code> tag add the following: <code>preloader=&quot;mx.preloaders.DownloadProgressBar&quot;</code>.</p>
            <p>If you are migrating an application from Flex 3 to Flex 4              , I do not recommend that you replace each of your Flex 3 MX components              with their corresponding Flex 4  components. This is probably not a good              investment of your time. Instead, move to the Flex 4  component              architecture for new applications. </p>
            <h4>Automation Library location change</h4>
    <p>In Flex 3, automation libraries were present under {sdk}/frameworks/libs and in the Flex 4 , it is available under {sdk}/frameworks/libs/automation.&nbsp;Users should ensure that they don’t have a copy of automation libraries under the frameworks/libs.&nbsp;</p>
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        An overview of Flex 4 architecture changes</h3>
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						<p>One of the major themes in the Flex 4 SDK is &quot;Design in Mind&quot;. This goal involves creating a smoother workflow between designers and developers. To help achieve this, the framework provides a clear separation of the visuals for a component and the rest of its behavior. In Flex 3, an individual component's code included logic around its behavior, layout, and visual changes. In Flex 4, the components are factored out into different classes, each handling specific pieces of behavior.</p>
<p>As specified in the <a target="_blank" href="http://opensource.adobe.com/wiki/display/flexsdk/Gumbo+Component+Architecture">Gumbo Architecture Document</a>:</p>
<p>&quot;The main component class, the one whose class name matches the component's MXML tag name, encapsulates the core behavior of the component. This includes defining what events the component dispatches, the data that component represents, wiring up any sub-components that act as parts of the main component, and managing and tracking internal component state (we discuss states in more detail below).</p>
<p>Coupled with that component class is a skin class which manages everything related to the visual appearance of the component, including graphics, layout, representing data, changing appearance in different states, and transitioning from state to state. In the Halo model, Flex component skins were assets responsible for only one part of the graphics of a component. Changing any other aspect of a component's appearance, like layout or visualization of states, required sub-classing the component and editing the ActionScript code directly. In the Gumbo model, all of this is defined declaratively in the skin class, primarily through new graphics tags called FXG tags.&quot;</p>
<p>To learn more about the new graphics tags in Flex 4, you can read the <a href="http://help.adobe.com/en_US/Flex/4.0/UsingSDK/WS145DAB0B-A958-423f-8A01-12B679BA0CC7.html">FXG documentation</a>.</p>
<p>As an example of the architecture discussed above, you can look at the code for the spark.components.Button class. This class only contains logic around the component's behavior. All of the visuals for this component are defined in the skin class spark.skins.spark.ButtonSkin</p>
<p>For performance reasons, the Flex 4 SDK has provided building blocks for developers to pick and choose the functionality that you need. Heavyweight functionality such as scrolling and virtualization that is not needed by all applications is not turned on by default.</p>
<h4><a name="_Namespaces_and_packages"></a>Namespaces and packages in Flex 4</h4>
<p>While keeping Flex 3 classes intact in the same mx.* packages, the Flex 4 SDK introduces the spark.* packages for components, core classes, effects, filters, layouts, primitives, skins, and utils.</p>
<p>The Flex 4 SDK provides a new set of components and effects that share many of the same class names as Flex 3 components. To avoid name collisions in MXML, the Flex 4 SDK comes with four distinct namespaces: MXML 2006, MXML 2009, Spark, and Mx.</p>
<p><b>MXML 2006:</b> The legacy MXML language namespace used in previous versions of Flex. Flex 3 applications compiled using Flex 4 can continue using this namespace.</p>
<p>URI: http://www.adobe.com/2006/mxml</p>
<p>Default Prefix: mx</p>
<p><b>MXML 2009:</b> The new MXML language namespace. This is purely a language namespace, and does <i>not</i> contain component tags.</p>
<p>URI: http://ns.adobe.com/mxml/2009<br>
 Default Prefix: fx</p>
<p><b>Spark:</b> This namespace includes all of the new Spark components. It should be used in conjunction with the MXML 2009 language namespace.</p>
<p>URI: library://ns.adobe.com/flex/spark<br>
 Default Prefix: s</p>
<p><b>MX:</b> This namespace includes all of the MX components. It should be used in conjunction with the MXML 2009 language namespace.</p>
<p>URI: library://ns.adobe.com/flex/mx<br>
 Default Prefix: mx</p>
<p>Here is a small example that uses the MXML 2009, Spark, and Halo namespaces to create a simple Flex 4 application. This sample uses a MX DateChooser and a Spark Button.</p>
</div>
				</div>
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        <code class="CodeBlock">&lt;s:Application
  xmlns:fx=&#034;http://ns.adobe.com/mxml/2009&#034;  
  xmlns:s=&#034;library://ns.adobe.com/flex/spark&#034;
  xmlns:mx=&#034;library://ns.adobe.com/flex/mx&#034;&gt;
    
    &lt;mx:DateChooser id=&#034;main_calendar&#034; x=&#034;20&#034; y=&#034;20&#034;/&gt;
    &lt;s:Button label=&#034;submit&#034; x=&#034;220&#034; y=&#034;20&#034;/&gt;
 
&lt;/s:Application&gt;</code>
    </div>
</div>
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						<p>Flex 4 SDK has also added multiple namespace support in CSS. If you are using the MXML 2009, Spark, and MX namespaces along with Type selectors, you will need to define a set of namespaces in your CSS definitions to avoid name collisions.</p>
<p>Here is an example of CSS that uses type selectors for both MX and Spark components:</p>
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				</div>
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        <code class="CodeBlock">&lt;fx:Style&gt;
 
    @namespace s &#034;library://ns.adobe.com/flex/spark&#034;;
    @namespace mx &#034;library://ns.adobe.com/flex/mx&#034;;
 
    s|Button {
        color: #FF0000;
    }
 
    mx|DateChooser {
        color: #FF0000;
    }
 
&lt;/fx:Style&gt;</code>
    </div>
</div>
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						<h4>Default Property and the Declarations tag</h4>
      <p>Prior to the release of the Flex 4 SDK, the Flex language        allowed the <code>Application</code> root tag to include visual children and        non-visual children. The visual children were added to the<code> Application</code> with <code>addChild()</code> and non-visual children were treated as property declarations.  Going        forward, non-visual children that represent new property declarations are not        allowed as immediate children of an <code>Application</code>. You can        add these non-visual children under a <code>&lt;fx:Declarations&gt;</code> tag. This includes non-visual children such as effects, validators, formatters,        data declarations, and RPC classes. Here is a short example:</p>
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				</div>
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        <code class="CodeBlock">&lt;s:Application xmlns:fx=&#034;http://ns.adobe.com/mxml/2009&#034;   
  xmlns:s=&#034;library://ns.adobe.com/flex/spark&#034;&gt;
    &lt;fx:Declarations&gt;
        &lt;s:Fade id=&#034;fadeEffect&#034; target=&#034;{targetButton}&#034; alphaFrom=&#034;1&#034; alphaTo=&#034;0&#034; /&gt;       
    &lt;/fx:Declarations&gt;
    &lt;s:Button id=&#034;targetButton&#034; /&gt;
    &lt;s:Button label=&#034;play effect&#034; click=&#034;fadeEffect.play()&#034; x=&#034;80&#034; /&gt;
&lt;/s:Application&gt;</code>
    </div>
</div>
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        <a id="articlecontentAdobe_numberedheader_1"></a>
        New components and containers</h3>
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<a name="articlecontentAdobe_text_8" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>As I mentioned earlier, Flex 4 SDK introduces a number of new component classes that use the new architecture, which should make skinning and other customizations much more straightforward. Here is a table showing Flex 3 MX components and their Flex 4 Spark counterparts:</p>
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				</div>
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						<table><tbody>
<tr>
<th>Flex 3 MX Component</th>
<th>Flex 4 Spark Component</th>
</tr>
<tr>
<td>mx.controls.Button</td>
<td>spark.components.Button</td>
</tr>
<tr>
<td>mx.controls.ButtonBar</td>
<td>spark.components.ButtonBar</td>
</tr>
<tr>
<td>mx.controls.CheckBox</td>
<td>spark.components.CheckBox</td>
</tr>
<tr>
<td>mx.controls.ComboBox</td>
<td>spark.components.DropDownList (w/o editability)</td>
</tr>
<tr>
<td>mx.controls.HorizontalList</td>
<td>spark.components.List (with a HorizontalLayout)</td>
</tr>
<tr>
<td>mx.controls.HRule</td>
<td>spark.primitives.Line</td>
</tr>
<tr>
<td>mx.controls.HScrollBar</td>
<td>spark.components.HScrollBar</td>
</tr>
<tr>
<td>mx.controls.HSlider</td>
<td>spark.components.HSlider</td>
</tr>
<tr>
<td>mx.controls.Image</td>
<td>spark.primitives.BitmapImage (w/o support for external images)</td>
</tr>
<tr>
<td>mx.controls.LinkBar</td>
<td>spark.components.ButtonBar (with a custom skin)</td>
</tr>
<tr>
<td>mx.controls.LinkButton</td>
<td>spark.components.Button (with a custom skin)</td>
</tr>
<tr>
<td>mx.controls.List</td>
<td>spark.components.List</td>
</tr>
<tr>
<td>mx.controls.NumericStepper</td>
<td>spark.components.NumericStepper</td>
</tr>
<tr>
<td>mx.controls.RadioButton</td>
<td>spark.components.RadioButton</td>
</tr>
<tr>
<td>mx.controls.RadioButtonGroup</td>
<td>spark.components.RadioButtonGroup</td>
</tr>
<tr>
<td>mx.controls.TextArea</td>
<td>spark.components.TextArea</td>
</tr>
<tr>
<td>mx.controls.TabBar</td>
<td>spark.components.TabBar</td>
</tr>
<tr>
<td>mx.controls.TextInput</td>
<td>spark.components.TextInput</td>
</tr>
<tr>
<td>mx.controls.TileList</td>
<td>spark.components.List (with a TileLayout)</td>
</tr>
<tr>
<td>mx.controls.ToggleButtonBar</td>
<td>spark.components.ButtonBar</td>
</tr>
<tr>
<td>mx.controls.VideoDisplay</td>
<td>spark.components.VideoPlayer</td>
</tr>
<tr>
<td>mx.controls.VRule</td>
<td>spark.primitives.Line</td>
</tr>
<tr>
<td>mx.controls.VScrollBar</td>
<td>spark.components.VScrollBar</td>
</tr>
<tr>
<td>mx.controls.VSlider</td>
<td>spark.components.VSlider</td>
</tr>
<tr>
<td>mx.core.Application</td>
<td>spark.components.Application</td>
</tr>
<tr>
<td>mx.core.Window</td>
<td>spark.components.Window</td>
</tr>
<tr>
<td>mx.core.WindowedApplication</td>
<td>spark.components.WindowedApplication</td>
</tr>
<tr>
<td>mx.containers.ApplicationControlBar</td>
<td>spark.components.Application (with the controlBarContent)</td>
</tr>
<tr>
<td>mx.containers.Canvas</td>
<td>spark.components.Group</td>
</tr>
<tr>
<td>mx.containers.ControlBar</td>
<td>spark.components.Panel (with the controlBarContent property)</td>
</tr>
<tr>
<td>mx.containers.HBox</td>
<td>spark.components.HGroup</td>
</tr>
<tr>
<td>mx.containers.Panel</td>
<td>spark.components.Panel</td>
</tr>
<tr>
<td>mx.containers.Tile</td>
<td>spark.components.Group (with a TileLayout)</td>
</tr>
<tr>
<td>mx.containers.VBox</td>
<td>spark.components.VGroup</td>
</tr>
</tbody>
</table>
</div>
				</div>
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						<p>Adobe encourages you to use MX components and containers along with Spark components. Because Adobe continues to build components atop the same base class (UIComponent), there should be full interoperability between Spark and MX. Here is a table of the components and containers that do not currently have direct Spark equivalent classes.</p>
</div>
				</div>
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						<table>        <thead>          <tr>
            <th><b>Flex 3 classes with no              direct Flex 4 counterpart</b></th>
          </tr>
        </thead>        <tbody>
          <tr>
            <td>mx.controls.Alert</td>
          </tr>
          <tr>
            <td>mx.controls.ColorPicker</td>
          </tr>
          <tr>
            <td> mx.controls.DataGrid</td>
          </tr>
          <tr>
            <td> mx.controls.DateChooser</td>
          </tr>
          <tr>
            <td> mx.controls.DateField</td>
          </tr>
          <tr>
            <td> mx.controls.Menu</td>
          </tr>
          <tr>
            <td> mx.controls.MenuBar</td>
          </tr>
          <tr>
            <td> mx.controls.PopUpButton</td>
          </tr>
          <tr>
            <td> mx.controls.PopUpMenuButton</td>
          </tr>
          <tr>
            <td> mx.controls.ProgressBar</td>
          </tr>
          <tr>
            <td> mx.controls.RichTextEditor</td>
          </tr>
          <tr>
            <td> mx.controls.Tree</td>
          </tr>
          <tr>
            <td> mx.containers.Accordion</td>
          </tr>
          <tr>
            <td> mx.containers.DividedBox</td>
          </tr>
          <tr>
            <td> mx.containers.Form</td>
          </tr>
          <tr>
            <td> mx.containers.Grid</td>
          </tr>
          <tr>
            <td> mx.containers.TabNavigator</td>
          </tr>
          <tr>
            <td> mx.containers.TitleWindow</td>
          </tr>
          <tr>
            <td> mx.containers.ViewStack</td>
          </tr>
        </tbody>
      </table>
</div>
				</div>
<a name="articlecontentAdobe_text_12" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>To use a MX Navigator (ViewStack, Accordion, TabNavigator) with Spark Components, the children of the navigator should be a NavigatorContent component. Otherwise, you will not be able to use Spark primitives in your MX navigator. Here is an example:</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_4" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;mx:ViewStack id=&#034;vs&#034; selectedIndex=&#034;{tb.selectedIndex}&#034;&gt;
	&lt;s:NavigatorContent label=&#034;bar&#034;&gt;
	   &lt;s:layout&gt;
	     &lt;s:VerticalLayout /&gt;
	   &lt;/s:layout&gt;
	   &lt;s:Label text=&#034;bar&#034; /&gt;
	   &lt;s:TextInput /&gt;
	&lt;/s:NavigatorContent&gt;
&lt;/mx:ViewStack&gt;</code>
    </div>
</div>
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						<h4>Changes in states syntax</h4>
      <p>Flex 4  has promoted the states functionality to a full        MXML language feature. As a result, you will likely find states to be much more        flexible and direct. The new states syntax is more <i>inline</i>, allowing        state-specific changes to be specified in context. Here are the key        differences in the Flex 4  syntax:</p>
      <ul>
        <li> Only states are defined within the states array. </li>
        <li> In the new states syntax, you cannot use <code>AddChild</code> and <code>RemoveChild</code>.          Instead, you define a component's role in a particular state on the component          itself using the <code>includeIn</code> and <code>excludeFrom</code> attributes. </li>
      </ul>
      <p class="Bullcont">In the following Flex 3 example, states are used to include a        Button and remove a TextInput only when the <code>currentState</code> of the        document is <code>submitState</code>. This approach can get very verbose with more        complex states.</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_5" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;mx:states&gt;
    &lt;mx:State name=&#034;submitState&#034; basedOn=&#034;&#034;&gt;
        &lt;mx:AddChild relativeTo=&#034;{loginForm}&#034; &gt;
           &lt;mx:Button label=&#034;submit&#034; bottom=&#034;10&#034; right=&#034;10&#034;/&gt;
        &lt;/mx:AddChild&gt;
        &lt;mx:RemoveChild target=&#034;{firstTextInput}&#034;/&gt;
    &lt;/mx:State&gt;
&lt;/mx:states&gt;
 
&lt;mx:TextInput id=&#034;firstTextInput&#034; /&gt;
&lt;mx:Canvas id=&#034;loginForm&#034; /&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_14" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Here is the simpler Flex 4  code using <code>includeIn</code> and <code>excludeFrom</code>.</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_6" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;s:states&gt;
    &lt;s:State name=&#034;submitState&#034; /&gt;
&lt;/s:states&gt;
&lt;s:TextInput id=&#034;firstTextInput&#034; excludeFrom=&#034;submitState&#034; /&gt;
&lt;s:Group id=&#034;loginForm&#034; &gt;
    &lt;s:Button label=&#034;submit&#034; bottom=&#034;10&#034; right=&#034;10&#034; includeIn=&#034;submitState&#034;/&gt;
&lt;/s:Group&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_15" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<ul>
        <li> <code>SetProperty</code>, <code>SetStyle</code>,          and <code>SetEventHandler</code> have been replaced by a new <i>dot</i> syntax, which allows you to qualify MXML          attribute values with a specific state identifier. </li>
      </ul>
      <p> In the following Flex 3 example, the code defines a property, style, and event        for a Button in <code>submitState</code>.</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_7" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;mx:states&gt;
    &lt;mx:State name=&#034;submitState&#034; basedOn=&#034;&#034;&gt;
        &lt;mx:SetProperty target=&#034;{submitButton}&#034; name=&#034;label&#034; value=&#034;submit&#034; /&gt;
        &lt;mx:SetStyle target=&#034;{submitButton}&#034; name=&#034;textDecoration&#034; value=&#034;underline&#034;/&gt;
        &lt;mx:SetEventHandler target=&#034;{submitButton}&#034; name=&#034;click&#034; handler=&#034;trace(&#039;done&#039;);&#034;/&gt;
    &lt;/mx:State&gt;
    &lt;mx:State name=&#034;clearState&#034; basedOn=&#034;&#034;&gt;
        &lt;mx:SetProperty target=&#034;{submitButton}&#034; name=&#034;label&#034; value=&#034;clear&#034; /&gt;
        &lt;mx:SetEventHandler target=&#034;{submitButton}&#034; name=&#034;click&#034; handler=&#034;emptyDocument()&#034; /&gt;
    &lt;/mx:State&gt;
&lt;/mx:states&gt;
 
&lt;mx:Button id=&#034;submitButton&#034; /&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_16" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>In Flex 4, the code looks like this:</p>
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				</div>
<a name="articlecontentAdobe_codeblock_8" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;s:states&gt;
    &lt;s:State name=&#034;submitState&#034; /&gt;
    &lt;s:State name=&#034;clearState&#034; /&gt;
&lt;/s:states&gt;
 
&lt;s:Button label.submitState=&#034;submit&#034; textDecoration.submitState=&#034;underline&#034;
   click.submitState=&#034;trace(&#039;done&#039;)&#034; click.clearState=&#034;emptyDocument()&#034;
   label.clearState=&#034;clear&#034; textDecoration.clearState=&#034;none&#034;/&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_17" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<ul>
        <li> A component can no longer be in an undefined or null state. By default,          the first declared state is the initial state of a component.<br>
          The new syntax is available when a document uses the MXML          2009 language namespace. You cannot mix the legacy syntax and the new states          syntax. The old syntax is available only in the MXML 2006 namespace.</li>
      </ul>
      <p class="Bullcont">Additionally, each component now supports a set of states        defined in its skin class, which makes it simpler to apply visual changes        depending on the state of a component. For example, if you look at the skin for        the Spark Button, you will find the following states defined:</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_9" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;s:states&gt;
    &lt;s:State name=&#034;up&#034; /&gt;
    &lt;s:State name=&#034;over&#034; /&gt;
    &lt;s:State name=&#034;down&#034; /&gt;
    &lt;s:State name=&#034;disabled&#034; /&gt;
&lt;/s:states&gt; </code>
    </div>
</div>
<a name="articlecontentAdobe_text_18" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>The ButtonSkin class defines what happens visually to a Spark Button in each one of these states.</p>
<p>This is only a brief introduction to the new Flex 4 states syntax. Visit the <a href="http://help.adobe.com/en_US/Flex/4.0/UsingSDK/WS2db454920e96a9e51e63e3d11c0bf69084-7fb4.html">Enhanced States documentation</a> to find more details.</p>
</div>
				</div>
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        <a id="articlecontentAdobe_numberedheader_2"></a>
        Changes in effects </h3>
</div>
<a name="articlecontentAdobe_text_19" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Many improvements have been made in the Flex 4 effects infrastructure. While MX effects will only work on controls based off of UIComponent, the Spark effects can operate on any target including the new graphic primitives in the framework. All of these effect classes live in the spark.effects.* package. Because Spark effects work on MX components, Spark components, and graphic primitives, Adobe recommends that you use Spark effect classes for future applications.</p>
<p>I've kept this description brief because you can get much more information about the new functionality in the effects classes from Chet Haase's <a href="/devnet/flex/articles/flex4_effects_pt1.html">Effects in Adobe Flex 4</a> article.</p>
<h4>Changes in layout</h4>
<p>In previous versions of Flex, the layout of components and containers were defined inside individual controls. Therefore, you had components such as List, TileList, and HorizontalList, which all share the same functionality except their layout. Still, their layout logic was defined within these component classes. In the Flex 4, layout has been decoupled from components. Now, Spark components such as Application, List, ButtonBar, and Panel can define their layouts declaratively. In all of the components, containment is managed by the Group class and the layout of the Group's children is delegated to an associated layout object. The layouts support both Spark and MX components in addition to the FXG graphic primitives. Layouts can even be changed at runtime.</p>
<p>As a developer, you can easily write custom layouts and swap them in and out of various individual components. Here is an example of defining a vertical List, horizontal List and a tiled List.</p>
<p>Vertical List (the default layout of a Spark List is VerticalLayout):</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_10" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;s:List /&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_20" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Horizontal List:</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_11" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;s:List&gt;
    &lt;s:layout&gt;
        &lt;s:HorizontalLayout /&gt;
    &lt;/s:layout&gt;
&lt;/s:List&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_21" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>Tiled List:</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_12" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;s:List&gt;
    &lt;s:layout&gt;
        &lt;s:TileLayout /&gt;
    &lt;/s:layout&gt;
&lt;/s:List&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_22" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>As I noted earlier, the Flex 4  architecture is set up to              provide developers with building blocks to pick and choose what functionality              they need. By default, virtualization and scrolling is not turned on. To add              the option for scrollbars on a Group and turn on virtualization, you will need              to:</p>
            <pparagraph>            1)     Set <code>useVirtualLayout</code> to <code>true</code> on your layout object<pparagraph>2)     Add a <code>Scroller</code> component to your Group.<p>Here is an example of using virtualization and scrolling on  a Spark Panel:</p>
</pparagraph></pparagraph></div>
				</div>
<a name="articlecontentAdobe_codeblock_13" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">&lt;s:Panel title=&#034;Horizontal Panel&#034; width=&#034;300&#034; height=&#034;220&#034; left=&#034;20&#034; top=&#034;20&#034;&gt;
    &lt;s:Scroller width=&#034;100%&#034; height=&#034;100%&#034;&gt;
        &lt;s:Group&gt;
           &lt;s:layout&gt;
               &lt;s:HorizontalLayout useVirtualLayout=&#034;true&#034; /&gt;
           &lt;/s:layout&gt;
           &lt;s:TextInput /&gt;
           &lt;s:Button label=&#034;clear&#034; /&gt;
           &lt;mx:DateChooser /&gt;
           &lt;s:Button label=&#034;submit&#034; /&gt;
        &lt;/s:Group&gt;
    &lt;/s:Scroller&gt;
&lt;/s:Panel&gt;</code>
    </div>
</div>
<a name="articlecontentAdobe_text_23" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>For more information regarding all of the enhancements in the Flex 4 layouts including better support for transformations, check out the <a href="http://help.adobe.com/en_US/Flex/4.0/UsingSDK/WS0141D24B-6AEB-4721-BA04-9BF15F86350F.html">Spark layout documentation</a>.</p>
</div>
				</div>
<a name="articlecontentAdobe_numberedheader_3" style="visibility:hidden"></a><div class="parbase compbase numberedheader section"><h3 class="TextH3 LayoutCellSides LayoutRow">
        <a id="articlecontentAdobe_numberedheader_3"></a>
        Working with text </h3>
</div>
<a name="articlecontentAdobe_text_24" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>All of the Spark components use the new text engine in Flash Player 10. These new classes offer low-level support for controlling text metrics, vertical text, typographic elements such as ligatures, and bidirectional text. The Flex 4 SDK has leveraged this functionality in all of the Spark components that use text. For more information on the text primitives and text components provided in Flex 4, see the “Text primitives” section of the <a href="http://opensource.adobe.com/wiki/display/flexsdk/Spark+Text+Primitives">Spark Text Primitives spec</a>.</p>
<p>The Spark components also now use the DefineFont4 embedded font format in Flash Player 10 and AIR 1.5. By default, the MX components do not use DefineFont4. This causes some overhead when mixing Spark and MX components in an Application and embedding fonts. If you want to use the same embedded font for all of your components, you will need to add an additional theme compiler argument to your project. With this new theme, both the MX and Spark components will use the same DefineFont4 font engine. You can add this compiler argument by checking an option “Use Flash Text Engine in MX components” in the Properties -&gt; Flex Compiler panel. (see Figure 3).</p>
</div>
				</div>
<a name="articlecontentAdobe_image_1" style="visibility:hidden"></a><div class="parbase image section"><div class="LayoutRow LayoutCellSides">
	<img title="Allow MX components to use DefineFont4 font engine. " alt="Allow MX components to use DefineFont4 font engine. " class="cq-dd-image  LayoutImage LayoutRow " src="/content/dotcom/en/devnet/flex/articles/flex3and4_differences/_jcr_content/articlecontentAdobe/image_1.adimg.mw.686.jpg/1279863867303.jpg"/></div>
<div class="TextSmall LayoutCellSides LayoutRowTop LayoutBigRowBottom">
        Figure 3. Allow MX components to use DefineFont4 font engine. </div>
</div>
<a name="articlecontentAdobe_text_25" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>When using text in a Flex 4 application, I recommend using one of Flex 4's three Spark text components. They all use the flash player's new text engine and will provide higher quality text, kerning and rotation for device fonts and bi-directional text. Here are the differences between the available text components in Flex 4.</p>
</div>
				</div>
<a name="articlecontentAdobe_text_26" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<table>  <thead>            <tr>
                <th>&nbsp;</th>
                <th>Multi-line</th>
                <th>Truncation</th>
                <th>Selectable</th>
                              </tr>
</thead><tbody>
                            <tr>
                <td>mx.controls.Label</td>
                <td>no</td>
                <td>yes</td>
                <td>yes</td>
              </tr>
              <tr>
                <td>mx.controls.Text</td>
                <td>yes</td>
                <td>no</td>
                <td>yes</td>
              </tr>
              <tr>
                <td>spark.components.Label</td>
                <td>yes</td>
                <td>yes</td>
                <td>no</td>
          </tr>
              <tr>
                <td>spark.primitives.RichEditableText</td>
                <td>yes</td>
                <td>yes</td>
                <td>no</td>
              </tr>
              <tr>
                <td>spark.primitives.RichText</td>
                <td>yes</td>
                <td>no</td>
                <td>yes</td>
               </tr>
</tbody>
</table>
<table>  <thead>            <tr>
                <th>&nbsp;</th>
                <th>Editable</th>
                <th>HTML formatting</th>
                <th>Scrolling</th>
                              </tr>
</thead><tbody>
                            <tr>
                <td>mx.controls.Label</td>
                <td>no</td>
                <td>yes</td>
                <td>no</td>
              </tr>
              <tr>
                <td>mx.controls.Text</td>
                <td>no</td>
                <td>yes</td>
                <td>no</td>
              </tr>
              <tr>
                <td>spark.components.Label</td>
                <td>no</td>
                <td>no</td>
                <td>no</td>
              </tr>
              <tr>
                <td>spark.primitives.RichEditableText</td>
                <td>no</td>
                <td>yes</td>
                <td>no</td>
              </tr>
              <tr>
                <td>spark.primitives.RichText</td>
                <td>yes</td>
                <td>yes</td>
                <td>yes</td>
              </tr>
</tbody>
</table>
</div>
				</div>
<a name="articlecontentAdobe_numberedheader_4" style="visibility:hidden"></a><div class="parbase compbase numberedheader section"><h3 class="TextH3 LayoutCellSides LayoutRow">
        <a id="articlecontentAdobe_numberedheader_4"></a>
        Backwards compatibility with Flex 3</h3>
</div>
<a name="articlecontentAdobe_text_27" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>As in Flex 3, you can compile your application with an additional compiler argument:</p>
</div>
				</div>
<a name="articlecontentAdobe_codeblock_14" style="visibility:hidden"></a><div class="parbase codeblock compbase section"><div class="PanelFillLight PanelBevelTop LayoutCell LayoutRow">
        <code class="CodeBlock">-compatibility-version=3.0.0.</code>
    </div>
</div>
<a name="articlecontentAdobe_text_28" style="visibility:hidden"></a><div class="text parbase section"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p>This compiler argument will allow your applications to use some of the Flex 3 behavior instead of the new Flex 4 behavior. To get a full list of backwards compatibility changes in Flex 4 that support the use of the <code>-compatibility-version</code> argument, see <span style="color: rgb(0, 0, 0);">the <a href="/go/learn_flex4_featuremigrate_en/" target="_blank">backwards compatibility document</a>.</span></p>
<p class="note"><b>Note:</b> You cannot selectively keep a subset of the Flex 4 behavioral changes when invoking Flex 3 compatibility. If you compile with the argument <code>-compatibility-version=3.0.0</code>, you will get all of the Flex 3 behavior described in the documentation.</p>
<h3>Where to go from here</h3>
<p>Hopefully, the migration from Flex 3 to the Flex 4 is relatively painless. The framework is designed to be mostly backwards compatible. Plus, once you get acquainted with the new architecture, you'll find that it is more ‘<b>flex</b>'ible! For more info on Flex 4 features, visit the <a target="_blank" href="http://help.adobe.com/en_US/Flex/4.0/FeaturesAndMigration/flex_4_features.pdf">web Help<span class="LayoutSmallGutterLeft Icon IconPillPdf"> </span></a>. The <a target="_blank" href="http://help.adobe.com/en_US/Flex/4.0/FeaturesAndMigration/flex_4_features.pdf">Flex 4 Features and Migration Guide<span class="LayoutSmallGutterLeft Icon IconPillPdf"> </span></a> would also be a good reference.</p>
</div>
				</div>
<a name="articlecontentAdobe_reference" style="visibility:hidden"></a><div class="parbase section reference"><div style="display:inline;" class="cq-dd-paragraph"><div class="text parbase"><div class="Semantic LayoutCellSides LayoutBreakAfter TextMedium TextBreak">
						<p><a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/3.0/" target="_blank"><img alt="Creative Commons License" style="border-width: 0pt;" src="http://i.creativecommons.org/l/by-nc-sa/3.0/88x31.png"></a><br>
This work is licensed under a <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/" rel="license" target="_blank">Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License</a></p>
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                                <li lang="hr"><a onClick="changeRegion('hr');">Hrvatska</a></li>
                                <li lang="en"><a onClick="changeRegion('eeurope');">Cyprus - English</a></li>                                
                                <li lang="cs"><a onClick="changeRegion('cz');">Česk&aacute; republika</a></li>
                                <li lang="da"><a onClick="changeRegion('dk');">Danmark</a></li>
                                <li lang="en"><a onClick="changeRegion('eeurope');">Eastern Europe - English</a></li>
                                <li lang="et"><a onClick="changeRegion('ee');">Eesti</a></li>
                                <li lang="fi"><a onClick="changeRegion('fi');">Suomi</a></li>
                                <li lang="fr"><a onClick="changeRegion('fr');">France</a></li>
                                <li lang="de"><a onClick="changeRegion('de');">Deutschland</a></li>
                                <li lang="en"><a onClick="changeRegion('eeurope');">Greece - English</a></li>
                                <li lang="hu"><a onClick="changeRegion('hu');">Magyarorsz&aacute;g</a></li>
                                <li lang="en"><a onClick="changeRegion('ie');">Ireland</a></li>
                                <li lang="en"><a onClick="changeRegion('il_en');">Israel - English</a></li>
                                <li lang="he"><a onClick="changeRegion('il_he');">&#1497;&#1513;&#1512;&#1488;&#1500; - &#1506;&#1489;&#1512;&#1497;&#1514;</a></li>
                                <li lang="it"><a onClick="changeRegion('it');">Italia</a></li>
                                <li lang="lv"><a onClick="changeRegion('lv');">Latvija</a></li>
                                <li lang="lt"><a onClick="changeRegion('lt');">Lietuva</a></li>
                                <li lang="de"><a onClick="changeRegion('lu_de');">Luxembourg - Deutsch</a></li>
                                <li lang="en"><a onClick="changeRegion('lu_en');">Luxembourg - English</a></li>
                                <li lang="fr"><a onClick="changeRegion('lu_fr');">Luxembourg - Fran&ccedil;ais</a></li>
                            </ul>
                        </div>
                        <div class="Column-3">
                            <ul>
                                <li lang="en"><a onClick="changeRegion('eeurope');">Malta - English</a></li>
								<li lang="ar"><a onClick="changeRegion('mena_ar');">&#1575;&#1604;&#1588;&#1585;&#1602; &#1575;&#1604;&#1571;&#1608;&#1587;&#1591; &#1608;&#1588;&#1605;&#1575;&#1604; &#1571;&#1601;&#1585;&#1610;&#1602;&#1610;&#1575; - &#1575;&#1604;&#1604;&#1594;&#1577; &#1575;&#1604;&#1593;&#1585;&#1576;&#1610;&#1577;</a></li>                                <li lang="en"><a onClick="changeRegion('mena_en');">Middle East and North Africa - English</a></li>
                                <li lang="fr"><a onClick="changeRegion('mena_fr');">Moyen-Orient et Afrique du Nord - Fran&ccedil;ais</a></li>
                                <li lang="nl"><a onClick="changeRegion('nl');">Nederland</a></li>
                                <li lang="no"><a onClick="changeRegion('no');">Norge</a></li>
                                <li lang="pl"><a onClick="changeRegion('pl');">Polska</a></li>
                                <li lang="pt"><a onClick="changeRegion('pt');">Portugal</a></li>
                                <li lang="ro"><a onClick="changeRegion('ro');">Rom&acirc;nia</a></li>
                                <li lang="ru"><a onClick="changeRegion('ru');">Россия</a></li>
                                <li lang="sr"><a onClick="changeRegion('rs');">Srbija</a></li>
                                <li lang="sk"><a onClick="changeRegion('sk');">Slovensko</a></li>
                                <li lang="sl"><a onClick="changeRegion('si');">Slovenija</a></li>
                                <li lang="es"><a onClick="changeRegion('es');">Espa&ntilde;a</a></li>
                                <li lang="sv"><a onClick="changeRegion('se');">Sverige</a></li>
                                <li lang="de"><a onClick="changeRegion('ch_de');">Schweiz - Deutsch</a></li>
                                <li lang="fr"><a onClick="changeRegion('ch_fr');">Suisse - Fran&ccedil;ais</a></li>
                                <li lang="it"><a onClick="changeRegion('ch_it');">Svizzera - Italiano</a></li>
                                <li lang="tr"><a onClick="changeRegion('tr');">T&uuml;rkiye</a></li>
                                <li lang="uk"><a onClick="changeRegion('ua');">Україна</a></li>
                                <li lang="en"><a onClick="changeRegion('uk');">United Kingdom</a></li>
                            </ul>
                        </div>
                        <div class="Column-4">
                            <ul>
                                <li lang="en"><a onClick="changeRegion('au');">Australia</a></li>
                                <li lang="zh"><a onClick="changeRegion('cn');">中国</a></li>
                                <li lang="zh"><a onClick="changeRegion('hk_zh');">中國香港特別行政區</a></li>
                                <li lang="en"><a onClick="changeRegion('hk_en');">Hong Kong S.A.R. of China</a></li>
                                <li lang="en"><a onClick="changeRegion('in');">India - English</a></li>
                                <li lang="ja"><a onClick="changeRegion('jp');">日本</a></li>
                                <li lang="ko"><a onClick="changeRegion('kr');">한국</a></li>
                                <li lang="en"><a onClick="changeRegion('nz');">New Zealand</a></li>
                                <li lang="zh"><a onClick="changeRegion('tw');">台灣</a></li>
                            </ul>
            
                            <p class="SiteFooterRegionPanelRegionHeader">Southeast Asia</p>
                            <ul>
                                <li lang="en"><a onClick="changeRegion('sea');">Includes Indonesia, Malaysia, Philippines, Singapore, Thailand, and Vietnam - English</a></li>
                            </ul>
                        </div>
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