flex glow

<?xml version="1.0" encoding="utf-8"?> 
<!-- Simple example to demonstrate the Glow effect. --> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" width="388"  
    height="356"> 
    <mx:Glow id="glowImage" duration="1000"  
        alphaFrom="1.0" alphaTo="0.3"  
        blurXFrom="0.0" blurXTo="50.0"  
        blurYFrom="0.0" blurYTo="50.0"  
        color="0x00FF00"/> 
    <mx:Glow id="unglowImage" duration="1000"  
        alphaFrom="0.3" alphaTo="1.0"  
        blurXFrom="50.0" blurXTo="0.0"  
        blurYFrom="50.0" blurYTo="0.0"  
        color="0x0000FF"/> 
    <mx:Panel title="Glow Effect Example" width="320" height="305"  
         horizontalAlign="center"> 
 
        <mx:Text width="100%" color="blue"  fontSize="12" 
            text="单击并按住鼠标在图像上看到glowImage效果。释放鼠标， 
                看看unglowImage效果。"/> 
        <mx:Image source="@Embed(source='assets/bg.jpg')"  
            mouseDownEffect="{glowImage}"  
            mouseUpEffect="{unglowImage}"/> 
    </mx:Panel> 
</mx:Application>