Help with Creating a drop down menu in flash

Hi All,

I am having some difficulty in completing the final stage of the drop down menu tutorial (http://www.kirupa.com/developer/mx/dropdownmenu.htm). I can’t seem to attach the final action script:

on(rollover){
gotoandstop(closed);
}

to the invisible button, in symbol edit mode. The message “Current selection, cannot have any actions applied to it” appears. Why is that? Can anybody please help. Thank you

Yours gratefully

RookieOfTheYear