Two MCs to play on one click?

Does anyone know how to make two movie clips play on the click of one button? When I place two gotoAndPlay actions, the second one plays only when you click the button the second time.

I would like them to play simultaneously. My book says gotoAndPlay can only reference one MC per block. Is there any way around this?

on (release) {
_level0.nav_holder.gotoAndPlay (“nav_expand”);

If i remember correctly you can change the button instances to track as menu item. This allows you to place to events on the same instance.