[Sintesis]

вот так можно:

package {
	import flash.display.MovieClip;
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	import flash.events.Event;
/**
	 * ...
	 * @author Me
	 */
	public class Main extends Sprite {
 
		public function Main() {
 
 
			addEventListener(Event.ADDED_TO_STAGE, addedToStageListener);
		}
 
		private function addedToStageListener(e:Event):void {
			removeEventListener(Event.ADDED_TO_STAGE, addedToStageListener);
 
			var circle:MovieClip = new MovieClip();
			circle.graphics.beginFill(0x000000);
			circle.graphics.drawCircle(300, 300, 20);
			circle.graphics.endFill();
			circle.addEventListener(MouseEvent.CLICK, mouseClickListener);
 
			stage.addChild(circle);
		}
 
		private function mouseClickListener(e:MouseEvent):void {
			trace ('olololololol'); //Никогда не вызывается
		}
    }
}