/// <summary>
/// HeaderProperty property changed handler.
/// </summary>
/// <param name="d">
/// HeaderedItemsControl that changed its Header.
/// </param>
/// <param name="e">Event arguments.</param>
private static void OnHeaderPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
HeaderedItemsControl source = d as HeaderedItemsControl;
source.OnHeaderChanged(e.OldValue, e.NewValue);
}
