Stage detection

programming flash
1

Sup y’all. it’s been a long while since I’ve worked in Flash, but I’m moving into AS3 and I’m wondering why the below actions only work when there’s a movie clip on the stage. What’s the point of assigning an event listener to the stage when you need an MC and could just as easily add the listener to the movieclip? BTW, the movieclip is has the same dimensions as the stage.

Thanks-

stage.addEventListener(MouseEvent.MOUSE_OVER, onHover);
stage.addEventListener(MouseEvent.MOUSE_OUT, onOut);

function onHover(event:MouseEvent):void {
    var up:Tween = new Tween(mcVideoControls, "y", Strong.easeOut, mcVideoControls.y, 275, 1, true);    
}

function onOut(event:MouseEvent):void {
    var down:Tween = new Tween(mcVideoControls, "y", Strong.easeOut, mcVideoControls.y, 315, 1, true);
}