public void AddScreen(GameScreen screen)
        {
            screen.screenManager = this;

            if (isInitialized)
            {
                screen.LoadContent();
            }

            screens.Add(screen);
        }
 public NameInputScreen(GameScreen parentScreen)
 {
     keyboardInput = new StringBuilder();
     keyboardStringBuilder = new KeyboardStringBuilder();
     ParentScreen = parentScreen;
 }
        /// <summary>
        /// Removes a screen from the screen manager. You should normally
        /// use GameScreen.ExitScreen instead of calling this directly, so
        /// the screen can gradually transition off rather than just being
        /// instantly removed.
        /// </summary>
        public void RemoveScreen(GameScreen screen)
        {
            // If we have a graphics device, tell the screen to unload content.
            if (isInitialized)
            {
                screen.UnloadContent();
            }

            screens.Remove(screen);
            screensToUpdate.Remove(screen);
        }