/// <summary>
/// Toggle the selection state of the item under the mouse when the mouse is clicked
/// </summary>
/// <param name="e"></param>
protected override void OnMouseClick(MouseEventArgs e)
{
//find the item that was clicked, if any
IListItem item = ItemAt(e.Location);
if (item == null)
{
return;
}
item.HandleMouseClick(e);
}