Flash menu displaying before the actionscript has drawn it.

Hello, I've made a menu using a loop for the number of buttons and "createEmptyMovieClip".

Problem is, sometimes it doesn't appear. One click on "refresh" and it does appear.

A pre-loader doesn't really work, as the movie is reliant on the processor client side. (if I haven't misinterpretted the way things work).

I can use an "if" statement to determine that all the buttons have been generated, but how would I stop the menu being displayed untill that has happened?

TIA