Button within a movie clip

I have created a drop-down menu using ‘Creating Drop-Down Menus’ from the Kirupa tutorials. The drop-down effect works well, however when I applied action script to the button, it did not work:

on (release) {
gotoAndStop(“Scene 1”, 120);
}

This does work correctly when applied to buttons directly in the scene. Is there some way I should modify the script when the button is in a movie clip?

Thanks