protected override void OnNavigatedTo(NavigationEventArgs e) { // Set the sharing mode of the graphics device to turn on XNA rendering SharedGraphicsDeviceManager.Current.GraphicsDevice.SetSharingMode(true); spriteBatch = new SpriteBatch(graphicsDevice); graphicsDevice.BlendState = BlendState.Additive; scene = new SubMenuScene(graphicsDevice); scene.LoadContent(contentManager); // Start the timer timer.Start(); base.OnNavigatedTo(e); }