private void OnItemPointerExit(object sender, RibbonRoutedEventArgs e)
        {
            RibbonGalleryItem selecteditem = (RibbonGalleryItem)(sender as RibbonGallery).SelectedItem;

            if (selecteditem != null)
            {
                viewModel.FontSize   = selecteditem.FontSize;
                viewModel.FontWeight = selecteditem.FontWeight;
            }
        }
        private void OnItemPointerEnter(object sender, RibbonRoutedEventArgs e)
        {
            RibbonGalleryItem selecteditem = (e.Source) as RibbonGalleryItem;

            if (selecteditem != null)
            {
                viewModel.FontSize   = selecteditem.FontSize;
                viewModel.FontWeight = selecteditem.FontWeight;
            }
        }