[abutler77]

I have been experimenting with the toolkit by making mods to the SphereVisual3DSample code in the Ab3d.DXEngine.Wpf.Samples project. I will send you my code changes separately. After reading your response, I discovered that the app will not crash if I first call Camera1.Refresh().

Now, the issue that I have is that FitToView in Loaded does not do the same thing as FitToView called later.