Calling a function on the main timeline?

programming flash
1

So this was quite simple in AS2, but considering that _root is no longer around, how can I call a function that is on the main time line from a nested movie clip?

This is what I have inside my movie clip:

this.hit_mc.addEventListener(MouseEvent.CLICK, updateScore);

I tried using Stage.updateScore, but that didn’t work either. This is the error I’m getting:

1119: Access of possibly undefined property Stage through a reference with static type flash.display:Stage.