Help with loading the buttons

How do I tell my movie with action script to load my buttons after the first elements are into place first. My borders load ok but I need my button layer to be not visible until the borders have loaded… and how do I tell it to load my buttons in a fade in manner?

I know there is a way and I tried different code but Can’t seem to get it right…

I am attaching my .fla file…

help!