Почему не срабатывает ROLL_OUT?

[zuxul]

Почему не срабатывает ROLL_OUT c контейнера "с2", когда я в обработчике клика переношу его ребенка на слой выше?

package 
{
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.geom.Point;
 
	public class Main extends Sprite 
	{
		public function Main() {
			if (stage) addedToStageListener();
			else addEventListener(Event.ADDED_TO_STAGE, addedToStageListener);
		}
 
		private function addedToStageListener(event:Event = null):void {
 
			var c1:Sprite = new Sprite();
			addChild(c1);
			c1.graphics.beginFill(0);
			c1.graphics.drawRect(0, 0, 60, 60);
			c1.graphics.endFill();
			c1.name = 'c1';
			c1.y = c1.x = 100;
 
			var c2:Sprite = new Sprite();
			c2.addEventListener(MouseEvent.CLICK, clickListener);
			c2.name = 'c2';
			c1.addChild(c2);
 
			c1.addEventListener(MouseEvent.ROLL_OVER, rollListener);
			c2.addEventListener(MouseEvent.ROLL_OVER, rollListener);
			c1.addEventListener(MouseEvent.ROLL_OUT, rollListener);
			c2.addEventListener(MouseEvent.ROLL_OUT, rollListener);
 
			var ch1:Sprite = new Sprite();
			ch1.graphics.beginFill(0x00FF00);
			ch1.graphics.drawRect(10, 10, 40, 40);
			ch1.graphics.endFill();
			ch1.name = 'ch1';
 
			var ch2:Sprite = new Sprite();
			ch2.graphics.beginFill(0xFF8000);
			ch2.graphics.drawRect(20, 20, 20, 20);
			ch2.graphics.endFill();
			ch2.name = 'ch2';
 
			c2.addChild(ch1);
			c2.addChild(ch2);
		}
 
		private function clickListener(event:Event):void {
			var obj:Sprite = event.target as Sprite;
			var p:Point = obj.localToGlobal(new Point(0, 0));
			stage.addChild(obj);
			obj.mouseEnabled = false;
			obj.x = p.x;
			obj.y = p.y;
		}
 
		private function rollListener(event:MouseEvent):void {
			trace(event.type + ':' + event.target.name);
		}
 
	}
}