How to add AS3 library project as module to an application project?

Hi!

I have an AS3 application that uses an AS3 library (which is also a separate IntelliJ project, etc), and I want to step-thru-debug this library while in use in (while running) the application.  In IntelliJ 11, I could easily add the library as a module to the parent application, BUT, this doesn't seem to work as expected in IntelliJ 12...

Urrrrrr, how do you do this? This should be easy, right?

Thanks!

adq