/// <summary>
/// ItemsSourceProperty property changed handler.
/// </summary>
/// <param name="d">DomainUpDown that changed its ItemsSource.</param>
/// <param name="e">Event arguments.</param>
private static void OnItemsSourcePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DomainUpDown dud = (DomainUpDown)d;
dud.OnItemsSourceChanged(e.OldValue as IEnumerable, e.NewValue as IEnumerable);
}
