How to use symbols in a loaded swf in flex builder 3

I want to load a swf file in flex as application with embed tag and then create instance of its class. I want to use symbols within this swf i.e. to load dynamically those symbols when needed and play with it. is it possible in flex builder 3? If yes then how and if not then how can it be done? Any suggestion/help is appreciated. :slight_smile: