Optimisation code AS3 pour Garbage Collector

package 
{
     import flash.events.*;
     public MyClass extends Movieclip()
     {
          private var myClip:Sprite;
          public function MyClass()
          {
               myClip = new Sprite();
               addChild(myClip);
               myClip.addEventListener(MouseEvent.CLICK, clicking);
          }
     }
}

import MyClass;
var o:MyClass = new MyClass();
addChild(o);

removeChild(myClip)
removeEventListener(MouseEvent.CLICK, clicking)
myClip = null

removeChild(o);

removeChild(myClip) 

removeChild(o);

package
{
	//imports
	public class myClass extends Sprite //par exemple
	{
		//declarations variables
		public function myClass()
		{
			this.addEventListener(Event.ADDED_TO_STAGE, initialize);
		}
		
		public function initialize(evt:Event)
		{
			this.addEventListener(Event.REMOVED_FROM_STAGE, destruct);
		}
		
		public function destruct(evt:Event)
		{
			this.removeEventListener(Event.REMOVED_FROM_STAGE, destruct);
			this.removeEventListener(Event.ADDED_TO_STAGE, initialize);
			//et remove de tout autre listener en ecoute dans la classe
		}
	}
}