Alt+tab works. Just was curious why it always opened minimized and if that could be changed.
What you call the "GSX menu", it's not the GSX menu. It's the standard Simconnect menu, which is shared and used by all Simconnect application. This to say that GSX ( or any other app ) doesn't have any control of its appearance, location, size, docked/undocked status, minimized/maximized status. Nothing.
The only thing GSX ( or any other application ) can do with the menu is to ask the sim "'please display a menu with those entries" and waiting to know if you selected one. That's it. It's a real black box to us ( or any other developer ), nothing you can see in the way it looks or it works is controlled by the add-ons.