When creating a Vassal Module, how do you add the maximize and minimize buttons to windows you create like the Main Map.
That’s controlled by a player’s preference setting.
Under Edit Preferences, make sure the option…
“Use combined application window”
…is unchecked. This will allow all your map windows to open as separate windows and they will then have a min and max button. Otherwise, you’re opening all your windows within the application window and they won’t have separate controls.