ADDED event in document class after removed from Stage

Question

Hi All,
I am currently play with the document class (the class acts as main) constructor for a SWF file.
package {
  import flash.display.*;
  import flash.events.*;
  public class TestSymbol extends MovieClip
    public function TestSymbol()
      this.addEventListener(Event.ADDED, function(event:Event) { trace(event.eventPhase, event.target, event.currentTarget, "added triggered"); });
      trace("parent", this.parent);
      this.stage.removeChild(this);
      trace("stage", this.stage);
In frame script 1, i put
trace("1");
trace("parent", this.parent);
After i run TestSymbol.swf and  i got
parent [object Stage]
stage null
2 [object TestSymbol] [object TestSymbol] added triggered
1
parent null
I wonder where is this ADDED event coming from? If the document class is added to some other objects, why its parent is null after the event?
Thanks in advance
Sam

Answer 1

By wrapper do you mean they are the same object or the MainTimeLine is a separate object being added to DocumentClass, as it triggers the ADDED event? I know that framescript can be accessed as documentClass functions, so I thought they are the same object, maybe i was wrong.
I did a new test within some more listeners
package {
  import flash.display.*;
  import flash.events.*;
  public class TestSymbol extends MovieClip
    public function TestSymbol()
      this.addEventListener(Event.ADDED_TO_STAGE, addedToStageListener);
      this.addEventListener(Event.ADDED, addedListener)
      this.addEventListener(Event.REMOVED_FROM_STAGE, removedFromStageListener);
      this.addEventListener(Event.REMOVED, removedListener);
      trace("parent", this.parent);
      this.stage.removeChild(this);
      trace("stage", this.stage);
     private function addedListener(event:Event):void {
       trace(event.eventPhase, event.target, event.currentTarget, "added triggered");
     private function addedToStageListener(event:Event):void {
       trace(event.eventPhase, event.target, event.currentTarget, "addedToStage triggered");
     private function removedListener(event:Event):void {
       trace(event.eventPhase, event.target, event.currentTarget, "removed triggered");
     private function removedFromStageListener(event:Event):void {
       trace(event.eventPhase, event.target, event.currentTarget, "removedFromStage triggered");
and this is the output
parent [object Stage]
2 [object TestSymbol] [object TestSymbol] removed triggered
2 [object TestSymbol] [object TestSymbol] removedFromStage triggered
stage null
2 [object TestSymbol] [object TestSymbol] added triggered
As the remove listeners are fired immediately, i don't think the queue is waiting until the end of the constructor.