as3proj is how flashdevelop saves projects. That's not important. Just look at Alice.as and Bob.as.

roottest.swf in the bin folder is the main loader swf. Bob.swf is from Bob.

Alice loads Bob with a Loader, and you get the output I showed above. You should be able to look at the code in the two .as files and apply it to your own project. I will attempt to open your updated cs3 version and see what I can do, but I'm currently busy with paid work so it might be a while.