when i set FixAirspace =true

[batsword]

The interface becomes a picture? But my container is video control

[chris84948]

Yeah, this won't work for that kind of application. This is really a hacky workaround for a dumb design issue in WPF. In your case, I'd think about making a new window without window chrome, and lock it in place over your window (essentially pretending to be the same window). Good luck.