Impervious to a Mask

I have a scrolling nav system that has popup tooltips. I have to have the nav under a mask for the scrolling ability, but it ends up cutting off the tooltips.

private var msk: Shape = new Shape();
...,0);,0, bg.width, bg.height);
menu.mask = msk;

Is there a way to assign specific elements under a mask to be unaffected?