If you use a Child Form ( ShowWindow = 0 or 1 ) into the _SCREEN,
and into a Control ( TextBox/EditBox... ) you use a
Ctrl+V ( Paste ),Ctrl+X or Ctrl+C
the Control.Keypress is not fired,
and Control.InteractiveChange is fired.

Result, you cannot use Keypress for trigger the Copy/Cut/Paste operation.

On Form not into _SCREEN, the keypress fired.