Code:

private void RepaintSplitterRect()
{
      if (!base.IsHandleCreated)
      {
            return;
      }
      Graphics graphics1 = base.CreateGraphicsInternal();
      if (this.BackgroundImage != null)
      {
            using (TextureBrush brush1 = new TextureBrush(this.BackgroundImage, WrapMode.Tile))
            {
                  graphics1.FillRectangle(brush1, base.ClientRectangle);
            }
      }
      else graphics1.FillRectangle(new SolidBrush(this.BackColor), this.splitterRect);

      graphics1.Dispose();
}