ADDED_TO_STAGE in keyframe as?

programming flash
1

This is really weird. I have 2 MC’s in Library, “mc” and “mc2”. Both are added in main timeline with

 
var aaa = new mc();
addChild(aaa)
var bbb = new mc2();
addChild(bbb)

“mc” has keyframe script and “mc2” a .as class file

“mc”

this.addEventListener(Event.ADDED_TO_STAGE,startall);
function startall(e:Event):void{
 trace("yes")
}

“mc2”

 
package {
 import flash.display.Sprite;
 import flash.events.Event;
 public class mc2 extends Sprite{
  public function mc2() {
   addEventListener(Event.ADDED_TO_STAGE,startall);
  }
  //---------------------------------
  public function startall(Evt:Event):void{
   trace("yes2")
  }
 }
}

Now the weird part; “mc2” traces ‘yes2’ but “mc” does not trace. Anybody any clue, principle is the same with difference that one is in .as and other in keyframe.

Did I oversee something?