Manipulator OnMouseDown event is not firing

Mike1955e 3 years ago in Defect? 0

I recently downloaded the latest code for the toolkit. I then tried out all of the demos and found that the manipulator demo does not work. All of the manipulators remain stationary. I placed a breakpoint at the OnMouseDown event and it was never reached. Can someone explain what I'm missing?

Media3D WPF