Why i like to use Casalib

I just started playing Actionscript 3.o. And I got some problem with Evnts. My code looks like something like this.

My movieClip Class is like this.

package{
import flash.display.MovieClip;
 import flash.events.Event;
 public class MC extends MovieClip {

  var val=1;
  var _o;
  public function MC() {
   _o=this;
   _o.addEventListener(Event.ENTER_FRAME,onLoop);
   }
  private function onLoop(e:Event) {
   trace(val);
   val++;
  }
 }
}

It's the code in the main.fla

b1_btn.addEventListener(MouseEvent.MOUSE_DOWN,clicked);
var m:MC=new MC();
addChild(m);

function clicked(e:MouseEvent) {
 removeChild(m);
 m=null;
}

The problem i get is with enterframe. After removing the Movieclip from the stage, enterframe don't stop it's working.
So i posted this in forums. It's the problem of garbage collection. Till now am playing with Actionscript 2.0 i never think about the garbage collection. The solution is to remove listeners manually or just use REMOVED_FROM_STAGE or REMOVED event.

So i have to change the MovieClip class to something like this.

package {
import flash.display.MovieClip; 
import flash.events.Event; 
public class Mextends MovieClip {
    var val=1;
    var _o;
   public function MC() {
      _o=this;
      _o.addEventListener(Event.ENTER_FRAME,onLoop,false,0,true);
      _o.addEventListener(Event.REMOVED,destroy);
    }
    private function destroy(e:Event) {
     _o.removeEventListener(Event.ENTER_FRAME,onLoop);
      _o.removeEventListener(Event.REMOVED,destroy);
    }
    private function onLoop(e:Event) {
    val++;
      trace(val);
    }
  }
}

This approach doesn't seem to me so good. So i searched in google and i get something more interesting .

It's casalib, an open source Actionscript Library for streamlining the development.

The most important thing interested me is the garbage collection using destroy() method. It will remove all events in the Movieclip.Then i just changed my code to some thing like this.

It's my MovieClip class

package {
  import org.casalib.display.CasaMovieClip;
 import flash.events.Event;
  public class MC extends CasaMovieClip {
    var val=1;
    var _o;
     public function MC() {
   _o=this;
   _o.addEventListener(Event.ENTER_FRAME,onLoop,false,0,true);
  }
  private function onLoop(e:Event) {
   trace(val);
   val++;
  
  }
 
 }
}

this is my code in Main.fla

b1_btn.addEventListener(MouseEvent.MOUSE_DOWN,clicked);
var m:MC=new MC();
addChild(m);
function clicked(e:MouseEvent) {
 m.destroy();
 m=null;
 trace(m);
}

And it works perfectly . Now am extensively using this library in my development. it's easy to remove nested movieclips and it's events.