public static void ExtendFrameIntoClientArea(this Form form, Control glassArea) { if (IsGlassSupported) { if (glassArea.Dock != DockStyle.Top) { glassArea.Dock = DockStyle.Top; glassArea.SendToBack(); } glassArea.BackColor = Color.Transparent; glassArea.Resize += delegate(object sender, EventArgs e) { form.Invalidate(glassArea.Region, true); }; form.Paint += delegate(object sender, PaintEventArgs e) { using (SolidBrush blackBrush = new SolidBrush(Color.Black)) { e.Graphics.FillRectangle(blackBrush, glassArea.ClientRectangle); } }; MARGINS marg; marg.Top = glassArea.Height; marg.Left = 0; marg.Right = 0; marg.Bottom = 0; DwmExtendFrameIntoClientArea(form.Handle, ref marg); glassArea.SetGlassWindowDragable(); } }