NSOutlineView with Multiple Core Data Entities

FROM : Garrett Bjerkhoel
DATE : Fri Jul 25 18:21:54 2008

I have a NSOutlineView hooked up to a NSTreeController, which has 
multiple entities inside of it. I would like to know how to set it up 
having each entity having its own "group". I have downloaded Jonathan 
Dann's example, which compiles but freezes. I can see how his Core 
Data model works, but I already have mine set.

Do I need to have both of my entities have a parent entity in which my 
NSTreeController reads from that one parent entity?

I have searched Google with this subject name with no luck...

Thanks,
Garrett