Fluent.InRibbonGallery.CoerceSelectedItem C# (CSharp) Method

        private static object CoerceSelectedItem(DependencyObject d, object basevalue)
        {
            InRibbonGallery gallery = (InRibbonGallery)d;
            if (!gallery.Selectable)
            {
                GalleryItem galleryItem = (GalleryItem)gallery.ItemContainerGenerator.ContainerFromItem(basevalue);
                if (basevalue != null && galleryItem != null) galleryItem.IsSelected = false;
                return null;
            }
            return basevalue;
        }