Flex图片处理问题 抛砖引玉！
最近碰到个很郁闷的问题！问题如下：
图片为
http://dl.iteye.com/upload/attachment/169178/701ff92d-245e-3265-952e-e6a6ab44f280.png
我想要取出其中的一个图标！
css 当中可以这样做
.panel{
background: transparent url('images/frame1.png') no-repeat 0px -25px;
}
但Flex似乎好像不可以，找了好久，也没找到解决方案！
这个方案想了好久才出来，但不知道好不好，效率怎样！
没办法，刚来flex。菜鸟一个！
<?xml version="1.0" encoding="utf-8"?><mx:Image xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="init()"><mx:Script><!public var imageURL:String;public var mywidth:Number=0;public var myheight:Number=0;public var myLeft:Number=0;public var myTop:Number=0;public var overLeft:Number=0;public var overTop:Number=0;private var bit:Bitmap;private var bmd1:BitmapData;private var bmd2:BitmapData;private var pt:Point;private var rect:Rectangle;public function init():void{loaded=new Loader();loaded.load(new URLRequest(imageURL));loaded.contentLoaderInfo.addEventListener(Event.COMPLETE,onload);if(overLeft>0 || overTop>0){this.addEventListener(MouseEvent.MOUSE_OVER,onover);this.addEventListener(MouseEvent.MOUSE_OUT,onout);}}public function onload(event:Event):void{bit=Bitmap(loaded.content); bmd1=bit.bitmapData;bmd2=new BitmapData(mywidth, myheight, true);rect=new Rectangle(myLeft, myTop, mywidth,myheight); pt=new Point(0, 0);bmd2.copyPixels(bmd1, rect, pt);var bm2:Bitmap=new Bitmap(bmd2);bm2.smoothing=true;this.addChild(bm2);}public function onover(event:MouseEvent):void{rect=new Rectangle(overLeft, overTop, mywidth,myheight);pt=new Point(0, 0);bmd2.copyPixels(bmd1, rect, pt);var bm2:Bitmap=new Bitmap(bmd2);bm2.smoothing=true;this.addChild(bm2);}public function onout(event:MouseEvent):void{rect=new Rectangle(myLeft, myTop, mywidth,myheight); pt=new Point(0, 0);bmd2.copyPixels(bmd1, rect, pt);var bm2:Bitmap=new Bitmap(bmd2);bm2.smoothing=true;this.addChild(bm2);}]]></mx:Script></mx:Image>
<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"xmlns:components="components.*" creationComplete="init()"><components:image overTop="118" buttonMode="true" myLeft="0" myTop="10" mywidth="54" myheight="50" imageURL="assets/ico/start_button.png"/></mx:Application>
请大家看看，看有没更好的方案！
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