tourdeflexmodules/src/spark/other/ControllingViewportExample.mxml

<?xml version="1.0" encoding="utf-8"?>
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  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
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      http://www.apache.org/licenses/LICENSE-2.0

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  distributed under the License is distributed on an "AS IS" BASIS,
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<s:Module xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx">
	
	<!-- To show only a certain area of a viewport, you can control it by setting the size of the viewport container
	     to be less than the size of the item you want to clip, and set  the following parameters, where the scroll
		 positions specify which part of the viewport to show (from container location 0,0)-->
	
	<s:Panel title="Controlling Viewport Sample" width="100%" height="100%">
		
		<s:layout>
			<s:VerticalLayout paddingLeft="10" paddingRight="10" paddingTop="10" paddingBottom="10" />
		</s:layout>
		
		<s:Label text="This image is clipped with the viewport position set:"/>
		<s:Group width="100" height="100"
				 horizontalScrollPosition="20" verticalScrollPosition="30"
				 clipAndEnableScrolling="true"> 
			<s:BitmapImage source="@Embed(source='assets/ApacheFlexLogo.png')"/> 
		</s:Group>  
		<s:Label text="This image is scrollable with the viewport position set:"/>
		<s:Scroller hasFocusableChildren="true" tabEnabled="false">
				<s:VGroup paddingLeft="2" paddingRight="2" paddingTop="2" paddingBottom="2" 
						  width="100" height="100" horizontalScrollPosition="20" verticalScrollPosition="30">
					<s:BitmapImage source="@Embed(source='assets/ApacheFlexLogo.png')"/>
				</s:VGroup>	
		</s:Scroller>
		
	</s:Panel>
</s:Module>