Flex 4： 一个向左移动 像右移动的效果

<?xml version="1.0" encoding="utf-8"?>
<s:Application 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="500" height="300">
    <s:layout>
        <s:BasicLayout/>
    </s:layout>

    <fx:Script>
        <![CDATA[
            protected function clickHandler(event:MouseEvent):void
            {
                // TODO Auto-generated method stub
                effect.end();
                effect.xTo = test.x == 490 ? 200 : 490;
                effect.play();
            }
        ]]>
    </fx:Script>

    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
        <s:Move id="effect" target="{test}"/>
    
    </fx:Declarations>
    <s:Border backgroundColor="0xff0000" backgroundAlpha="0.4" width="100%" height="100%">
        <s:layout><s:BasicLayout/></s:layout>
        <s:Panel id="test" title="我是移动的Panel" 
                 x="200" y="5" width="290" height="290" 
                 backgroundColor="0x00ff00"
                 click="clickHandler(event)"/>
    </s:Border>
</s:Application>