/// <summary>
        /// Constructor.
        /// </summary>
        public OptionsMenuScreen(Options globalOptions)
            : base("Options")
        {
            this.globalOptions = globalOptions;
            // Create our menu entries.
            fullScreen = new MenuEntry(string.Empty);
            debugOptions = new MenuEntry(string.Empty);
            soundEnable = new MenuEntry(string.Empty);
            cursorEnable = new MenuEntry(string.Empty);

            SetMenuEntryText();

            MenuEntry back = new MenuEntry("Back");

            // Hook up menu event handlers.
            fullScreen.Selected += FullscreenMenuEntrySelected;
            debugOptions.Selected += DebugMenuEntrySelected;
            soundEnable.Selected += SoundEnableEntrySelected;
            cursorEnable.Selected += CursorEnableEntrySelected;
            back.Selected += OnCancel;

            // Add entries to the menu.
            MenuEntries.Add(fullScreen);
            MenuEntries.Add(debugOptions);
            MenuEntries.Add(soundEnable);
            MenuEntries.Add(cursorEnable);
            MenuEntries.Add(back);
        }
        /// <summary>
        /// Constructor fills in the menu contents.
        /// </summary>
        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");
            MenuEntry tutorial = new MenuEntry("Tutorial");
            MenuEntry credits = new MenuEntry("Credits");
            MenuEntry controls = new MenuEntry("Controls");

            // Hook up menu event handlers.
            playGameMenuEntry.Selected += PlayGameMenuEntrySelected;
            optionsMenuEntry.Selected += OptionsMenuEntrySelected;
            exitMenuEntry.Selected += OnCancel;
            tutorial.Selected += OnTutorial;
            credits.Selected += OnCredits;
            controls.Selected += OnControls;

            // Add entries to the menu.
            MenuEntries.Add(playGameMenuEntry);
            MenuEntries.Add(optionsMenuEntry);
            MenuEntries.Add(controls);
            MenuEntries.Add(tutorial);
            MenuEntries.Add(credits);
            MenuEntries.Add(exitMenuEntry);
        }
        /// <summary>
        /// Constructor.
        /// </summary>
        public PauseMenuScreen()
            : base("Paused")
        {
            // Create our menu entries.
            MenuEntry resumeGameMenuEntry = new MenuEntry("Resume Game");
            MenuEntry optionsMenuEntry = new MenuEntry("Options");
            MenuEntry quitGameMenuEntry = new MenuEntry("Quit Game");

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

            quitGameMenuEntry.Selected += QuitGameMenuEntrySelected;
            optionsMenuEntry.Selected += OptionsMenuEntrySelected;

            // Add entries to the menu.
            MenuEntries.Add(resumeGameMenuEntry);
            MenuEntries.Add(optionsMenuEntry);
            MenuEntries.Add(quitGameMenuEntry);
        }