Oh I just realized, the collection was created under the UpdateProblem Business Object! That must be why it is gray, I added the wrong one. Heading home now but I will try to work this out tomorrow and let you know how it goes.
Update: I see the Collection now, but I have no idea how to add it to a form so now I am really lost. I will post step by step tomorrow what I did to get to this point so maybe it will make more sense.