flex图片上画图

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<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
	
	
	<mx:Style>
		Application {
			fontSize: 12pt;
		}
	</mx:Style>
	
	
	<mx:Script>
		<![CDATA[
			import mx.core.UIComponent;
			
			var template:UIComponent;
			var template2:UIComponent;

			protected function btn1_clickHandler(event:MouseEvent):void
			{
				template = new UIComponent();
				template.graphics.clear();
				template.graphics.lineStyle( 1,0x0000FF );
				template.graphics.beginFill( 0xFFFFFF,0.2 );
				template.graphics.drawRoundRect( 0,50,20,20 );
				image.addChild(template);
				
				template2 = new UIComponent();
				template2.graphics.clear();
				template2.graphics.lineStyle( 1,0x0000FF );
				template2.graphics.beginFill( 0xFFFFFF,0.2 );
				template2.graphics.drawRoundRect(80,80,20 );
				image.addChild(template2);
				
//source="@Embed('img/0.jpg')"
			}


			protected function btn2_clickHandler(event:MouseEvent):void
			{
				image.removeChildAt(1);
			}

		]]>
	</mx:Script>
	
	
			<mx:Image  id="image" source="@Embed('img/0.jpg')"  width="200" height="200">		
			</mx:Image>
	<mx:Button id="btn1" click="btn1_clickHandler(event)" label="画图"/>
	<mx:Button id="btn2" click="btn2_clickHandler(event)" label="撤销"/>
</mx:Application>