flash – mouseChildren = false对我来说效果不好

我想将事件处理与容器及其子容器分开.如您所见,我的源代码非常简单：

package  {
    import flash.display.Sprite;
    import flash.display.*;
    import flash.events.*;

    public class test extends Sprite{

        public function test() {
            var container:Sprite = new Sprite();  // my container
            container.graphics.beginFill(0,1);  // whatever the color
            container.graphics.drawRect(0,100,100); // origin at 0,0
            container.graphics.endFill();
            addChild(container);

            var decor:Sprite = new Sprite();  // and it child
            decor.graphics.beginFill(0,1);  // whatever the color
            decor.graphics.drawRect(200,200,100);  // origin at 200,200
            decor.graphics.endFill();
            container.addChild(decor);
            container.mouseChildren = false;
            container.addEventListener(MouseEvent.ROLL_OVER,onOver,false,true);
        }
        private function onOver(e: MouseEvent):void {
            trace("ROLL trace");
        }
    }
}

当我滚动容器对象时,我已经得到了跟踪(对我而言).
但是当我翻过装饰物时,我也得到了痕迹(不是我想要的).
我只是希望容器由鼠标事件触发,而不是孩子.
那么我的mouseChildren = false发生了什么？我不明白……