Preloaders and "export for AS"

I’m having problems with my preloader…

Main timeline- first frame…preloader.
second frame… mc; within that mc I am using the “export for action script” propery in the properties panel on another mc…

the problem - the “export for action script” is over-riding my preloader. When I check the “export in first frame” to off, the mc no longer functions…

This can’t be right, can it? If you use “export for action script” will you no longer be able to use a preloader???

any help, pleeeeeeaze!?!?

Thanks so much for any help