/// <summary>
/// Callback for changes to the any behavioral property.
/// Transfers the new value to a FlowDocument.
/// </summary>
/// <remarks>
/// Behavioral properties must be transferred to any document whether it has Standalone
/// or Inherited FormattingDefaults. All such values are set as local values even
/// in case when they are equal to the ones inherited from the UI context.
/// Such strong logic is needed to work correctly in any sequence of
/// setting FormattingDefaults property and adding children.
/// </remarks>
private static void OnBehavioralPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RichTextBox richTextBox = (RichTextBox)d;
richTextBox.TransferBehavioralProperty(e.Property, e.NewValue);
}