Getting loaded SWF to use a function from main.fla document class

I have a main movie with thumb movieclips that load new children and stops the main movie’s animation. Within the child there is a close buttion that removes itself. I also wanted the close button to start the animation of the main movie again once it removed the child. Since I am using a document class to load everything for the main move, how can the close button from the loaded swf use a function from the main document class?

Thanks