Displays the FPS
Inheritance: Microsoft.Xna.Framework.DrawableGameComponent
        public FarseerPhysicsGame()
        {
            Window.Title = "Farseer Samples Framework";
            _graphics = new GraphicsDeviceManager(this);
            _graphics.PreferMultiSampling = true;
#if WINDOWS || XBOX
            _graphics.PreferredBackBufferWidth = 1280;
            _graphics.PreferredBackBufferHeight = 720;
            ConvertUnits.SetDisplayUnitToSimUnitRatio(24f);
            IsFixedTimeStep = true;
#elif WINDOWS_PHONE
            _graphics.PreferredBackBufferWidth = 800;
            _graphics.PreferredBackBufferHeight = 480;
            ConvertUnits.SetDisplayUnitToSimUnitRatio(16f);
            IsFixedTimeStep = false;
#endif
#if WINDOWS
            _graphics.IsFullScreen = false;
#elif XBOX || WINDOWS_PHONE
            _graphics.IsFullScreen = true;
#endif

            Content.RootDirectory = "Content";

            //new-up components and add to Game.Components
            ScreenManager = new ScreenManager(this);
            Components.Add(ScreenManager);

            FrameRateCounter frameRateCounter = new FrameRateCounter(ScreenManager);
            frameRateCounter.DrawOrder = 101;
            Components.Add(frameRateCounter);
        }
        protected override void Initialize()
        {
            _input = new InputHelper();
#if WINDOWS
            _counter = new FrameRateCounter();
            _showFPS = false;
#endif
            _isExiting = false;

            base.Initialize();
        }