protected void InitialiseGameScreens()
{
_pauseScreen = new PauseScreen(this);
_gameOverScreen = new GameOverScreen(this);
_startScreen = new StartScreen(this);
WaitCallback loadGameCallback = new WaitCallback(LoadMainGameScreen);
ThreadPool.QueueUserWorkItem(loadGameCallback);
_activeScreen = _startScreen;
_inactiveScreens.Add(_pauseScreen);
_inactiveScreens.Add(_gameOverScreen);
}
