private static object CoerceItemTemplate(DependencyObject d, object baseValue)
{
RibbonGalleryCategory category = (RibbonGalleryCategory)d;
return PropertyHelper.GetCoercedTransferPropertyValue(category,
baseValue,
ItemsControl.ItemTemplateProperty,
category.RibbonGallery,
RibbonGallery.GalleryItemTemplateProperty);
}