public override void Draw(DrawingContext context, IList <IDrawableObject> drawables) { if (this.Viewport != (BoundingRectangle)context.GraphicsDevice.Viewport.TitleSafeArea) { this.Viewport = (BoundingRectangle)context.GraphicsDevice.Viewport.TitleSafeArea; } if (Viewport == null) { throw new ArgumentNullException("Viewport"); } BoundingRectangle bounds = new BoundingRectangle { X = Viewport.X, Y = Viewport.Y, Width = Viewport.Width, Height = Viewport.Height, }; var availableSize = new Vector2(bounds.Width, bounds.Height); pages.ForEach <Page>(o => o.Measure(availableSize)); pages.ForEach <Page>(o => o.Arrange(bounds)); pages[SelectedIndex].Render(Renderer); base.Draw(context, drawables); }