Overlapping Menus in Flash CS3 - Problem that I can't Figure Out

Hey everyone. I’m struggling desperately with this flash file.

I have these two buttons here (check out the fla file) that contain popout menus. I am using a hittest to get the buttons to pop out and subsequently play in reverse.

Anyway - when you mouse over the button and the submenu pops out, I can’t figure out how to disable the button that the menu overlaps.

When you mouse over one button, and then scroll down the popout menu (which overlaps the button below it), the lower button’s menu pops out as well.

I’ve been trying to figure out how to disable the other button while the other one is being “moused over”, but I can’t figure out how. Any tips or tricks?

Regards, Tom