Just to let you know, we all keep learning. I just learned something myself about Poser's Cloth room and the Grouping tool. First, understand that i can't STAND Poser's grouping tool. Never liked it, never will.  So  I never really learned how to use it all that well.

However, I've also had a problem  with selecting somethings in the Cloth room to add to a dynamic group such as buttons. If you'll notice on the Dawn render I posted before, there are no buttons on the shirt.  No matter how hard I tried, I couldn't select all the verts of the buttons to add them to the rigid  group of the sim.  I had been told to select by material zone, but I couldn't figure out quite how to do that. The grouping tool didn't seem to see any mat zones. Finally, KobaltKween finally broke it down for me how to do it. The result is below... with buttons on the shirt.