Hi Marvin,
it’s difficult to follow you.
If you mean that the keyboard focus is shifted to the platform control of VSTGUI if you click inside of it, then this is expected behaviour.
You have to be a good citizen and only handle keyboard input events for the events you are actually using. Do you by any chance have a global keyboard hook registered on the CFrame object ? Then you must make sure to return the correct value when not handling the keyboard event.
cheers
Arne