/// <summary>
        /// Constructor.
        /// </summary>
        public OptionsScreen()
            : base("Options")
        {
            // Create our menu entries.
            MusicMenuEntry = new MenuEntry(string.Empty);
            SoundMenuEntry = new MenuEntry(string.Empty);

            VolumeMusicMenuEntry = new MenuEntry(string.Empty);
            VolumeSoundMenuEntry = new MenuEntry(string.Empty);

            SetMenuEntryText();

            MenuEntry back = new MenuEntry("Back");

            // Hook up menu event handlers.
            MusicMenuEntry.Selected += MusicMenuEntrySelected;
            SoundMenuEntry.Selected += SoundMenuEntrySelected;

            VolumeMusicMenuEntry.Left += VolumeMusicMenuEntryLeft;
            VolumeMusicMenuEntry.Right += VolumeMusicMenuEntryRight;

            VolumeSoundMenuEntry.Left += VolumeSoundMenuEntryLeft;
            VolumeSoundMenuEntry.Right += VolumeSoundMenuEntryRight;

            back.Selected += OnCancel;

            // Add entries to the menu.
            MenuEntries.Add(MusicMenuEntry);
            MenuEntries.Add(SoundMenuEntry);

            MenuEntries.Add(VolumeMusicMenuEntry);
            MenuEntries.Add(VolumeSoundMenuEntry);

            MenuEntries.Add(back);
        }
        /// <summary>
        /// Constructor.
        /// </summary>
        public PauseMenuScreen()
            : base("Paused")
        {
            // Create our menu entries.
            MenuEntry resumeGameMenuEntry = new MenuEntry("Resume Game");
            MenuEntry quitGameMenuEntry = new MenuEntry("Quit Game");

            // Hook up menu event handlers.
            resumeGameMenuEntry.Selected += OnCancel;
            quitGameMenuEntry.Selected += QuitGameMenuEntrySelected;

            // Add entries to the menu.
            MenuEntries.Add(resumeGameMenuEntry);
            MenuEntries.Add(quitGameMenuEntry);
        }
        public MainMenuScreen()
            : base("Main Menu")
        {
            // Create our menu entries.
                MenuEntry playGameMenuEntry = new MenuEntry("Play Game");
                MenuEntry optionsMenuEntry = new MenuEntry("Options");
                MenuEntry exitMenuEntry = new MenuEntry("Exit");

                // Hook up menu event handlers.
                playGameMenuEntry.Selected += PlayGameMenuEntrySelected;
                optionsMenuEntry.Selected += OptionsMenuEntrySelected;
                exitMenuEntry.Selected += OnCancel;

                // Add entries to the menu.

                MenuEntries.Add(playGameMenuEntry);
                MenuEntries.Add(optionsMenuEntry);
                MenuEntries.Add(exitMenuEntry);
        }