flex 动态加载ImageMap

<?xml version="1.0" encoding="utf-8"?>
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<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" styleName="blackButton"
layout="vertical"
horizontalAlign="center" verticalAlign="middle" verticalScrollPolicy="off" horizontalScrollPolicy="off"
xmlns:baseClasses="flexlib.baseClasses.*" creationComplete="addCB()">

<mx:Style>
.blackButton{
base-color:#FFFFFF;
}
</mx:Style>

<mx:Script>
<![CDATA[

import flexlib.controls.ImageMap;
import flexlib.controls.area;
import flexlib.events.ImageMapEvent;

private function addCB():void
{
var imgmap:ImageMap =new ImageMap();
imgmap.showToolTips=true;

var xmlarea:area=new area();
xmlarea.shape="POLY";
xmlarea.coords="85,11,133,11,134,42,114,42,100,47,96,45,91,48,83,40,76,40,75,29,70,23,71,18,82,20,87,18";
xmlarea.alt="WA";
xmlarea.href="http://www.baidu.com";
imgmap.map=new Array(xmlarea);

imgmap.source="usa.jpg";

//imgmap.addEventListener(ImageMapEvent.SHAPE_CLICK,function(e:ImageMapEvent):void{mx.controls.Alert.show("imagemap click:"+e.href);});
imgmap.addEventListener(ImageMapEvent.SHAPE_OVER,function(e:ImageMapEvent):void{

mx.controls.Alert.show("imagemap click:"+e.href);

});
myHB.addElement(imgmap);

}
]]>
</mx:Script>

<mx:Button label="add ImageMap" click="addCB()" x="32" y="25"/>
<mx:Panel id="myHB" x="235" y="89" width="900" height="600"></mx:Panel>
</mx:Application>