public void onEvent(DifficultySelectedEvent evt)
        {
            mFlippedId   = -1;
            mPlayingGame = new Game();
            mPlayingGame.BoardConfiguration = new BoardConfiguration(evt.Difficulty);
            mPlayingGame.Theme = mSelectedTheme;
            mToFlip            = mPlayingGame.BoardConfiguration.NumTiles;

            // arrange board
            arrangeBoard();

            // start the screen
            mScreenController.openScreen(ScreenController.Screen.GAME);
        }
 public virtual void onEvent(DifficultySelectedEvent evt)
 {
 }