GameWindow Left/Top screen position

As my application is a 3D editor/player, in edit mode, I need the application to remember and restore the window's position to sit around the other controls and toolbars/floating tool panels etc.. except I can't find a way to remember the GameWindow's left and top position information. Can this be added please? Or if not, some pointers on where to modify the code to achieve this would be greatly appreciated.

Best Regards,

Euan.