Need help with hitTest

I’m trying to create a pop-up menu. I’ve gotten it to work, however, I’m using an invisable button to control when the mouse is over, or when it leaves so that the menu will hide itself back down.

I’m having problems though. It seems that when I but a button or ANYTHING using the rollOver or rollOut tags that it messes with the invisable button and hides the menu.

I figure I need a hitTest? Can anyone help me with one of these?