One way you can do this is to use the CellsPainting event to draw the
bitmap for a particular header cell. Here is code that does this
assuming the bitmap is in an imagelist.

//this.images is an ImageList with your bitmaps
void dataGridView1_CellPainting(object sender,
DataGridViewCellPaintingEventArgs e)
{
   if (e.ColumnIndex == 1 && e.RowIndex == -1)
   {
       e.PaintBackground(e.ClipBounds, false);

       Point pt = e.CellBounds.Location;// where you want the bitmap
in the cell
       int offset = (e.CellBounds.Width -
this.images.ImageSize.Width) / 2;
       pt.X += offset;
       pt.Y += 1;
       this.images.Draw(e.Graphics, pt, 0);
       e.Handled = true;
   }
}
==================
Clay Burch
Syncfusion, Inc.