tourdeflexmodules/src/spark/effects/FadeExample.mxml

<?xml version="1.0"?>
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  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:mx="library://ns.adobe.com/flex/mx"
	xmlns:s="library://ns.adobe.com/flex/spark">	
	
	<fx:Declarations>
		<s:Fade id="fadeEffect" target="{targetImg}" alphaFrom="{Number(fromVal.text)}" alphaTo="{Number(toVal.text)}"
				repeatCount="2" repeatBehavior="reverse" effectStart="playButton.enabled=false"
				effectEnd="playButton.enabled=true"/>
	</fx:Declarations>
	
	<s:Panel title="Fade Effect Sample" width="100%" height="100%">
		
		<s:layout>
			<s:HorizontalLayout paddingLeft="10" paddingRight="10" paddingTop="10" paddingBottom="10" />
		</s:layout>
		
		<s:VGroup>
			<s:HGroup verticalAlign="middle">
				<s:Label text="Fade alpha from:" verticalAlign="bottom"/>
				<s:TextInput id="fromVal" text="1.0" widthInChars="3"/>
			</s:HGroup>
			<s:HGroup verticalAlign="middle">
				<s:Label text="Fade alpha to:" verticalAlign="bottom"/>
				<s:TextInput id="toVal" text="0.0" widthInChars="3"/>
			</s:HGroup>
			<s:Button id="playButton"
					  left="5" bottom="5"
					  label="Fade" click="fadeEffect.play()"/>
		</s:VGroup>
		
		<s:BitmapImage id="targetImg" width="200" height="200" source="@Embed(source='assets/ApacheFlexLogo.png')"/>
		
		<s:Label width="180" verticalAlign="justify" 
					 text="The Fade effect changes the alpha of a target using the following parameters: alphaFrom, alphaTo. Click 'Fade' to watch the effect."/>
		
	</s:Panel>
</s:Module>