frameworks/projects/spark/asdoc/en_US/spark/components/examples/PopUpAnchorExample.mxml

<?xml version="1.0" encoding="utf-8"?>
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<!-- Simple example to demonstrate the Spark PopUpAnchor component -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
			   xmlns:s="library://ns.adobe.com/flex/spark">
	
	<fx:Style>
		.popUpForm
		{
			contentBackgroundColor : #FF0000;			
			paddingTop : 2;
			paddingBottom : 2; 
			paddingLeft : 2; 
			paddingRight : 2;
		}
	</fx:Style>
	
	<s:Panel width="75%" height="75%" title="My PopUpAnchor Example">		
		
		<!-- Group with default layout so that openBtn and PopUpAnchor will be on top of 
		each other such that the popUp can be positioned relative to the button -->
		<s:Group x="10" y="10">
			<!-- Button used to open PopUp -->
			<s:Button id="openBtn" label="Open PopUp" click="frmPUA.displayPopUp=true"/>
			
			<!-- PopUpAnchor component set to same size as openBtn to ensure that
			popUp will be positioned relative to the button -->
			<s:PopUpAnchor id="frmPUA" popUpPosition="below" styleName="popUpForm" width="92" height="21">
				<!-- BorderContainer to hold popUp contents -->
				<s:BorderContainer>			
					<s:layout>
						<s:VerticalLayout paddingTop="5" paddingLeft="5" paddingBottom="5" paddingRight="5"/>
					</s:layout>
					<s:Form>											
						<s:FormItem label="Name :">
							<s:TextInput/>
						</s:FormItem>											
						<s:FormItem label="E-Mail :">
							<s:TextInput/>
						</s:FormItem>
					</s:Form>							
					<s:HGroup>																
						<!-- Button used to close popUp -->
						<s:Button label="CLOSE" click="frmPUA.displayPopUp=false"/>
					</s:HGroup>				
				</s:BorderContainer>						
			</s:PopUpAnchor>	
		</s:Group>
		
	</s:Panel>    	
</s:Application>