FLEX中的Effect效果触发器

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Image id="myImg"
source="@Embed(source='C:/Documents and Settings/Administrator/面/assets/logo1.jpg')"
x="134"
y="70"
visible="{myCheck.selected}"
showEffect="{my}"
hideEffect="{my}"/>
<mx:WipeDown id="my"/>
<mx:CheckBox id="myCheck"
x="360"
y="158"
width="79"
label="sadfasd f"/>
<mx:Button click="myImg.visible=!myImg.visible" x="360" y="188"/>
</mx:Application>

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="absolute">
<mx:Image id="myImg"
source="@Embed('C:/Documents and Settings/Administrator/桌面/assets/logo1.jpg')"
x="134"
y="70"
visible="{myCheck.selected}"
showEffect="{my}"
hideEffect="{my}"/>
<mx:Parallel id="my">
<mx:WipeLeft/>
<mx:Blur/>
</mx:Parallel>
<mx:CheckBox id="myCheck"
x="360"
y="158"
width="79"
label="sadfasd f"/>
<mx:Button click="myImg.visible=!myImg.visible"
x="360"
y="188"/>
</mx:Application>