FlashPlayer默认的Focus矩形的范围

如果Sprite的子对象尺寸大于Sprite的可视尺寸，Sprite获得Focus后，默认Focus矩形的大小并非Sprite的可视大小。

见示例：

package
{
	import flash.display.Sprite;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;	
	public class b extends Sprite
	{
		public function b()
		{
			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.align = StageAlign.TOP_LEFT;
			

			var sp:Sprite = new Sprite();
			sp.buttonMode = true;
			sp.graphics.beginFill(0xff0000);
			sp.graphics.drawRect(0,300,300);
			sp.graphics.endFill();
			sp.x=100;
			sp.y=100;
			addChild(sp);
			
			var con:Sprite = new Sprite();
			//con.buttonMode = true;
			con.graphics.beginFill(0x00ff00);
			con.graphics.drawRect(0,500,500);
			con.graphics.endFill();
			con.x=10;
			con.y=10;
			
			var mask:Sprite = new Sprite();
			//con.buttonMode = true;
			mask.graphics.beginFill(0x00ff00);
			mask.graphics.drawRect(0,200,200);
			mask.graphics.endFill();
			mask.x=10;
			mask.y=10;
			con.mask =mask;
			
			sp.addChild(con);
			sp.addChild(mask);
			
			trace(sp.width,sp.height);
			
		}
		
	}
}