LF Cascading/Drop Menu Tutorial for MX 2004

I have yet to find a tutorial on how to create a cascading menu like the one featured [COLOR=#22229c]here[/COLOR] for Flash MX 2004. I need to have the bottom buttons move down when buttons above them are clicked and the submenus appear…hope that makes sense.

Any suggestions or words of encouragement?
Maybe I’m using the wrong term for the style of menu…

Thanks!