Windows 7. Move it completely away from the visible area.
Moving the form using the mouse away from the visible area works. I was trying to move it programmatically, and that only moves to visible screen area edges.
I used your code. Added a new form to the new application and added the OnCreate event. After launching, the form disappeared from the screen. To check, I pressed Alt + space, selected the move and moved it back to the visible area with the mouse.