Удалить "себя" через некоторое время.

[Lyso]

package{
	import flash.utils.Timer;
	import flash.events.TimerEvent;
	import flash.display.Sprite;
	import flash.events.Event;
 
	public class RandCircle extends Sprite{
		private var timer:Timer=new Timer(100);
		private var circle:Circle;
 
		public function RandCircle(){
			timer.addEventListener(TimerEvent.TIMER,onTimer);
			circle.addEventListener(circle.REMOVE_ME,onRemoveChild);
			timer.start();
		}
 
		private function onTimer(e:TimerEvent):void{
			circle=new Circle;
			addChild(circle);
			trace(this.numChildren);
		}
 
		private function onRemoveChild(e:Event):void{
			removeChild(Circle(e.target));
		}
 
 
	}
 
}