New Post: Nested Region within Popup Window

Thank you once again for the quick response. It has taken me a few days to get around to trying this out.

With this solution I am indeed able to make the PopupWindowActionSample work as expected. However my real solution was still failing. The difference between my solution and the sample is that the Shell of my solution actually contains the PopupWindowAction and associated buttons etc. The sample initially directs all of this to a MainRegion.

Once again if I modify the sample in this way I am able to see the failing result. I feel that I'm dwelling in the subtleties of Prism's region management and appreciate your guidance.

Thanks