void CustomWinGrid_MouseClick(object sender, MouseEventArgs e)
        {
            UltraGrid grid = sender as UltraGrid;
            if (grid == null) return;
            UIElement controlElement = this.DisplayLayout.UIElement;
            UIElement elementAtPoint = controlElement != null ? controlElement.ElementFromPoint(e.Location) : null;
            UltraGridColumn column = null;
            while (elementAtPoint != null)
            {
                HeaderUIElement headerElement = elementAtPoint as HeaderUIElement;
                if (headerElement != null &&
                     headerElement.Header is Infragistics.Win.UltraWinGrid.ColumnHeader)
                {
                    column = headerElement.GetContext(typeof(UltraGridColumn)) as UltraGridColumn;
                    break;
                }
                elementAtPoint = elementAtPoint.Parent;
            }
            /* it will check for the selected column and if any selected column found
             * it will set the selected property of the all cells. this part is required 
             * to apply cut,copy,paste functionality.
             */
            if (column != null)
            {
                foreach (UltraGridRow row in grid.Rows)
                {
                    if (!row.Cells[column.Index].Selected)
                        row.Cells[column.Index].Selected = true;
                    else
                        row.Cells[column.Index].Selected = false;
                }
            }
        }