FLEX移动效果问题

<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:fx="http://ns.adobe.com/mxml/2009"
  xmlns:s="library://ns.adobe.com/flex/spark"
  xmlns:mx="library://ns.adobe.com/flex/halo" width="600" height="600">
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
<mx:Move id="picMove" xfrom="0" xBy="2" xTo="50" yfrom="0" yBy="2" yTo="50"/>
<mx:Glow id="picGlow" alphafrom="0.7" alphaTo="1.0" inner="true" knockout="true" strength="5"/>
</fx:Declarations>



<mx:Image x="0" y="0" width="256" height="256" source="file:///E|/BMS/work place/CLS/WebRoot/flex/pic/chooselesson.png" id="chooselesson" mouseOver="{picMove}"/>
</mx:Canvas>

为什么不能移动呢？这是一个自定义组件，谢谢

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http://www.cnblogs.com/Fooo/archive/2009/10/31/1593711.html

Flex研究——显示对象平滑移动
http://www.javaeye.com/topic/162463

http://blog.csdn.net/kunshan_shenbin/archive/2009/03/04/3957032.aspx

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不是mouseOver="{picMove}"
mouseover是事件不是