remove or destroy child completely - actionscript-3

Question

I've got a child named "viseur" that appears on a particular scene and replace my actual cursor.
When the event "removeViseur" is called, I would like to completely remove the child "viseur" (and I'll use my previous cursor).
I did that :
stage.addEventListener("functionCalled", removeViseur, false, 0, true);
public function removeViseur(e:Event):void{
trace("removeViseur");
viseur.visible = false;
viseur.parent.removeChild(viseur);
viseur = null;
}
The child "viseur" is no longer here, but if do Alt+tab or changing window and came back, the child "viseur" come back...
Do you know how I can destroy it completely ? (I don't need it after this function is called)
Thx,
EDIT
Here is more of my code.
public static var viseur:Viseur;
var lookCocoDessous:Boolean = thisBack == "cocotierDessous";
if (lookCocoDessous) {
viseur = new Viseur(stage);
stage.addChild(viseur);
viseur.visible = true;
stage.addEventListener("functionCalled", removeViseur, false, 0, true);
public function removeViseur(e:Event):void{
trace("removeViseur");
viseur.visible = false;
viseur.parent.removeChild(viseur);
viseur = null;
}
And "viseur" has is own class like that
viseur.as :
public class Viseur extends MovieClip
{
private var engine:Engine;
private var stageRef:Stage;
private var p:Point = new Point();
public function Viseur(stageRef:Stage)
{
Mouse.hide(); //make the mouse disappear
mouseEnabled = false; //don't let our cursor block anything
mouseChildren = false;
this.stageRef = stageRef;
x = stageRef.mouseX;
y = stageRef.mouseY;
stageRef.addEventListener(MouseEvent.MOUSE_MOVE, updateMouse, false, 0, true);
stageRef.addEventListener(Event.MOUSE_LEAVE, mouseLeaveHandler, false, 0, true);
stageRef.addEventListener(Event.ADDED, updateStack, false, 0, true);
}
private function updateStack(e:Event) : void
{
stageRef.addChild(this);
}
private function mouseLeaveHandler(e:Event) : void
{
visible = false;
Mouse.show(); //in case of right click
stageRef.addEventListener(MouseEvent.MOUSE_MOVE, mouseReturnHandler, false, 0, true);
}
private function mouseReturnHandler(e:Event) : void
{
visible = true;
Mouse.hide(); //in case of right click
removeEventListener(MouseEvent.MOUSE_MOVE, mouseReturnHandler);
}
private function updateMouse(e:MouseEvent) : void
{
x = stageRef.mouseX;
y = stageRef.mouseY;
e.updateAfterEvent();
}
}
}
}

Answer 1

Viseur is adding itself to the stage whenever Event.ADDED fires. This fires whenever anything is added to the stage (not just Viseur). You've also made Viseur a static property, thus ensuring it doesn't disappear from memory.
To be succinct: add Viseur only once, and from outside of itself (thereby removing the need to pass a stage reference). Be aware that once a DisplayObject is parented, it automatically gains stage & root properties which you can reference for mouseX and mouseY.
That said, if you're trying to replace the mouse cursor, I highly recommend taking a different tact: Native cursors.
See http://inflagrantedelicto.memoryspiral.com/2012/07/as3-quickie-native-mouse-cursors/