The standard code for having a transparent IE toolbar:

protected override void OnPaintBackground(PaintEventArgs e) {   IntPtr hdc = e.Graphics.GetHdc();    Rectangle rec = new Rectangle(e.ClipRectangle.Left, e.ClipRectangle.Top, e.ClipRectangle.Width, e.ClipRectangle.Height);   DrawThemeParentBackground(this.Handle, hdc, ref rec);   e.Graphics.ReleaseHdc(hdc);}

it’s found everywhere, however it’s just plain wrong. There are lots of redrawing issues when you are using controls with transparent background (that is, labels, buttons etc). Luckily you can easily fix them by having Rectangle rec = new Rectangle(0, 0, Bounds.Width, Bounds.Height);