protected override void OnPaint(PaintEventArgs e) { if (_layoutManager != null) { _layoutManager.Render(e.Graphics); } //Size size1 = new Size(100, 100); //Size size2 = new Size(50, 50); //e.Graphics.DrawRectangle(Pens.Black, new Rectangle(new Point(10, 10), size1)); //size1 = Size.Add(size1, size2); //e.Graphics.DrawRectangle(Pens.Red, new Rectangle(new Point(10, 10), size1)); }