protected override void contextMenuStrip_Cell_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
switch (e.ClickedItem.ToString())
{
case "Edit":
StartEditing(sender, e);
break;
case "Delete This Cell":
ParentGrid.DeleteCell(this.Row, this.Colomn);
break;
case "Insert Cell":
ParentGrid.GetFooterCell(Row).OnMouseClick(this, null);
break;
}
}