public static void OnIconSizeFrontChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            DualFabricIconControl sender = o as DualFabricIconControl;

            if (sender != null)
            {
                sender.fabicnFront.FontSize = sender.IconSizeFront;
            }
        }
        public static void OnForegroundChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            DualFabricIconControl sender = o as DualFabricIconControl;

            if (sender != null)
            {
                sender.fabicnFront.Foreground = sender.Foreground;
            }
        }
        public static void OnGlyphNameBackChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
        {
            DualFabricIconControl sender = o as DualFabricIconControl;

            if (sender != null)
            {
                sender.fabicnBack.GlyphName = sender.GlyphNameBack;
            }
        }