private static void OnSignOutCommandChanged(DependencyObject d,
                                                    DependencyPropertyChangedEventArgs e)
        {
            ShellHeader ShellHeaderControl = d as ShellHeader;

            ShellHeaderControl.OnSignOutCommandChanged(e);
        }
        private static void OnProgressBarVisibilityChanged(DependencyObject d,
                                                           DependencyPropertyChangedEventArgs e)
        {
            ShellHeader ShellHeaderControl = d as ShellHeader;

            ShellHeaderControl.OnProgressBarVisibilityChanged(e);
        }
        private static void OnUserNameChanged(DependencyObject d,
                                              DependencyPropertyChangedEventArgs e)
        {
            ShellHeader ShellHeaderControl = d as ShellHeader;

            ShellHeaderControl.OnUserNameChanged(e);
        }