无法显示mc 郁闷啊。。。

[TopFans]

显示不出画的矩形， 而且输入的宽度是0
package {
import flash.display.Sprite;
import flash.display.MovieClip;
import flash.display.SimpleButton;
[SWF(backgroundColor="#3F3D3E",width=677, height=123)]
public class TestMarsk extends Sprite
{
var mc1:Sprite= new Sprite();
var mc2: MovieClip = new MovieClip();
public function TestMarsk()
{
mc1 = new Sprite();
mc1.width = 200;
mc1.height = 200;
this.addChild(mc1);
trace( mc1.width );
var bgColor:uint = 0xffeeff;
mc1.graphics.clear();
mc1.graphics.beginFill(bgColor);
mc1.graphics.drawRect(50, 50,50,50);
mc1.graphics.endFill();

}
}
}

[pig2]

import flash.display.Shape;

var child:Shape = new Shape();
child.graphics.beginFill(0x111111);
child.graphics.lineStyle(1, 0x111111);
child.graphics.drawRect(0, 0, 100, 100);
child.graphics.endFill();
addChild(child);

[TopFans]

为啥用mc不行
其实我是想测试一个mask效果
mask好像也实现不了。。