private void goToScene(int pointer) {
        Debug.println("go to scene :" + pointer);
        Scene nextScene = null;
        boolean exit = false;
        switch (pointer) {
           /* case CREDIT_BUTTON:
                nextScene = new CreditScreen(engine);
                break;
            case HELP_BUTTON:
                nextScene = new HelpScreen(engine);
                break;*/
            case OPTION_BUTTON:
                nextScene = new OptionScreen(engine);
                break;
            case PLAY_BUTTON:
                nextScene = new StageSelection(engine);
                break;
            case QUIT_BUTTON:
                exit = true;
                break;
            case SHOP_BUTTON:
                nextScene = new ShopScreen(engine);
                break;
        }

        if (exit) {
            closeApp();
        } else {
            changeScene(nextScene);
        }
    }