Generated ActionScript is really only provided for reference; it's not really intended to be repurposed in that sense. Indeed, if you even have any, you've most likely compiled your project already anyway (unless you got it from somewhere else), so one might ask why you'd want to compile the generated stuff rather than your own source -- but nonetheless, although I haven't actually tried it, you should be able to point the Flex compiler mxmlc at your generated source to compile it, provided you're able to get all your dependencies to line up (which may be what you mean by "gluing it all together").
Just a thought, although again, I haven't actually tried it, so your results may vary. What is it you're trying to do, though? Just curious. :)