how to display wait window nowait like window in upper right corner of form and keep it ?

wait window nowait shows message in upper right corner of screen and closes message if mouse is moved so it cannot used.

Is it possible to use define window to draw similar message inside form ?
Is is possible to pass form name as window name to define window ?

Or is it possible use Form.Box() or similar method to draw wait window like window and keep it open ?
Or any other idea ?