RealFuels.Tanks.TankWindow.UpdateGUIState C# (CSharp) Method

        void UpdateGUIState()
        {
            enabled = tank_module != null;
            EditorLogic editor = EditorLogic.fetch;
            if(!enabled &&  editor != null)
                editor.Unlock("MFTGUILock");
        }

 public static void HideGUI()
 {
     if (instance != null)
     {
         instance.tank_module = null;
         instance.UpdateGUIState();
     }
 }