function updateCMSFields(&$fields)
 {
     if ($brands = DataObject::get('ProductBrand')) {
         $fields->addFieldToTab('Root.Content.Main', $ddf = new DropDownField('BrandID', 'Brand', $brands->toDropDownMap()), 'FeaturedProduct');
         $ddf->setHasEmptyDefault(true);
     }
 }