REMOVED_FROM_STAGE called on creation

Question

I have a class called MyClass which needs to detect when it is ADDED and REMOVED from stage so i can remove event listeners and set variables to null when MC is removed for GC optimizations.
My working document is: as3, fp 10 and have tried it with and without strictmode
This is my class:
public class MyClass extends MovieClip {
        public function MyClass() {
            addEventListener(Event.ADDED_TO_STAGE, onAdded, false,0,true);
        private function onAdded(event:Event):void {
            event.target.removeEventListener(event.type, onAdded);
            trace("added " + this.name);
            addEventListener(Event.REMOVED_FROM_STAGE, onRemoved, false,0,true);
            //add listeners here
        private function onRemoved(event:Event):void {
            event.target.removeEventListener(event.type, onRemoved);
            trace("removed " + this.name);
            //remove listeners here for GC
I linked a MovieClip from my library to this class and put it on the stage manually in the IDE. When i run it i get these traces: "added", "removed"
So just after adding it to the stage it dispatches removed_from_stage event while it actually doesn't remove the object.
A workaround for this would be replacing Event.ADDED_TO_STAGE with Event.RENDER, because RENDER get's fired After ADDED, but i'm working on a public API and i don't think that's best practice
Note: if i create a new document and just copy and paste the MC from my working document to the new document, it works as expected. But as i said, this is a public API, so i can't tell people to create new documents when it fails...
So my questions are:
why is this happening? is it a bug?
how can we solve this?
is replacing ADDED_TO_STAGE with RENDER bad practice?

Answer 1

The FlipViewTransition effect does some reparenting internally to accomplish the 3D effect.  As a result you receive multiple add and remove events.  To work around this, I would recommend using FlexEvent.ADD and FlexEvent.REMOVE instead of addedToStage.  You can also try using ViewNavigatorEvent.REMOVING.
Chiedo