/// <summary>
/// IsFocusedProperty property changed handler.
/// </summary>
/// <param name="d">TabItem that changed IsFocused.</param>
/// <param name="e">DependencyPropertyChangedEventArgs.</param>
private static void OnIsFocusedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TabItem ti = d as TabItem;
Debug.Assert(ti != null);
ti.OnIsFocusChanged(e);
}