[AS3] fully functional pre-loader... is it even possible?

hey

so i have a pre-loader, and it works fine… until i start unchecking ‘export in first frame’, and dumping everything on frame 2 like i did back in AS2
even though im moving to frame 3 before tying to use any of the exported classes, it acts like they dont exist

ive been searching for a solution to the problem for the last half hour or so, but i cant find anything, is it even possible to have a functional preloader in AS3?

thanks