/**
  * @param FieldList $fields
  */
 function updateCMSFields(FieldList $fields)
 {
     $newfields = array(new SortableUploadField('AdditionalImages', _t('SHOPEXTENDEDIMAGES.AdditionImages', 'Additional Images')), new LiteralField('additionalimagesinstructions', '<p>' . _t('SHOPEXTENDEDIMAGES.Instructions', 'You can change the order of the Additional Images by clicking and dragging on the image thumbnail.') . '</p>'));
     if ($fields->hasTabset()) {
         $fields->addFieldsToTab('Root.Images', $newfields);
     } else {
         foreach ($newfields as $field) {
             $fields->push($field);
         }
     }
 }