/// <summary>
 /// Provides one click access to custom columns.
 /// This may or may not be something you want but wanted to
 /// show how it can be done
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void DataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e)
 {
     if (DataGridView1[e.ColumnIndex, e.RowIndex].EditType != null)
     {
         if (DataGridView1.IsCalendarCell(e) || DataGridView1.IsTimeCell(e))
         {
             SendKeys.Send("{F2}");
         }
     }
 }