Tweening a movieclip in the parent

1

Hi

I have a main.fla and few movieclips inside it.

Lets take t1_mc for instance which has a button called next inside it


next_btn.addEventListener(MouseEvent.CLICK, goNext);
function goNext(event:MouseEvent){
	MovieClip(parent).gotoAndStop("t2");
}

On the main timeline there is another movieclip called popup_mc which has a marker_mc inside it. I want to be able to tween the y position of the marker_mc. How do I create this hierarchy in code?

I know if it was all in the main timeline I could use

TweenLite.to(popup_mc.marker_mc, 0, {y:-127});

Thank you