private static void OnNotifyHeaderPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RibbonTab tab = (RibbonTab)d;
tab.NotifyPropertyChanged(e);
RibbonTabHeader tabHeader = tab.RibbonTabHeader;
if (tabHeader != null)
{
tabHeader.NotifyPropertyChanged(e);
}
}