private void newGame()
        {
            manager = null;
            manager = RTSManager.Instance(Window.ClientBounds.Width, Window.ClientBounds.Height, Content);
            RTSManager.NewGame();

            curState = gameState.Playing;
        }
        public static RTSManager Instance(int WindowWidth, int WindowHeight, ContentManager content)
        {
            instance = new RTSManager();
            instance.setContentManger(content);
            instance.setWindowLimits(WindowWidth, WindowHeight);

            return instance;
        }