To Button or not to Button...?

That is the question. Yesterday I read a forum here at Kirupa ('cause you guys rock!) that went along the lines of rather use MCs then Buttons. So being new to flash, I tried it last night on my flash project for a dropdown menu and half went MAD trying to get things to work my way!!!

If MCs are truely better to use than Buttons, then how does one get a simple
**on(rollOver) **script to work on an MC.

Please help, anyone…