Roll-out menu with sub-menu: clickthrough issues

Simple question - I’m sure this is common, but I couldn’t find what I needed:

I have a roll-out menu with several submenus. All are placed on the main timeline however (the submenus aren’t inside the main menu MC). The obvious problem is: when the user rolls over one of the sub-menus, the ROLL_OUT action is triggered and the main menu rolls back in.

How can I set a sprite or mc to recognize moue actions, but also allow them to “sink” through to another level?