private static object OnCoerceFilterItemContainerStyleSelector(DependencyObject d, object baseValue)
{
RibbonGallery gallery = (RibbonGallery)d;
if (baseValue == null ||
gallery.FilterItemContainerStyle != null ||
gallery.AllFilterItemContainerStyle != null)
{
return new RibbonGalleryDefaultFilterItemContainerStyleSelector(gallery);
}
return baseValue;
}