Hi Lamis,

You can use the DataGridView.CellPainting event to add custom drawing to any
cell.  Set the DataGridViewCellPaintingEventArgs.Handled property to prevent
the custom drawing to be erased.

This code will add a magenta rectangle on top of any column called "Button",
in this case this happens to be a DataGridViewButtonColumn.

       protected override void OnLoad(EventArgs e)
       {
           DataGridViewButtonColumn bc = new DataGridViewButtonColumn();
           bc.Name = "Button";
           dataGridView1.Columns.Add(bc);
           dataGridView1.CellPainting += new
DataGridViewCellPaintingEventHandler(dataGridView1_CellPainting);
       }

       void dataGridView1_CellPainting(object sender,
DataGridViewCellPaintingEventArgs e)
       {
           if (e.ColumnIndex == -1 || e.RowIndex == -1)
               return;

           if (dataGridView1.Columns[e.ColumnIndex].Name == "Button")
           {
               e.Paint(e.CellBounds, DataGridViewPaintParts.All);
               e.Graphics.FillRectangle(Brushes.Magenta, e.CellBounds.Left
+ 10, e.CellBounds.Top + 5, 10, 10);
               e.Handled = true;
           }
       }