Why is binding refresh delayed until completion of delegate Command? (MVVM)?

Chances are the binding is being updated, but because you're doing "lots of stuff" on the UI thread, the application isn't getting a chance to update the screen. You should consider moving the processing to a background thread or using Dispatcher.BeginInvoke() so that the UI is free to update and display your wait message.

I did get Rory's solution working, with a bit of tweaking. I ended up doing this.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.