class PhotoPagina extends Page {

public static $has_many = array(
'Fotos' => 'Photo'
);

public function getCMSFields() {
   $fields = parent::getCMSFields();
      
$gridFieldConfig = GridFieldConfig_RecordEditor::create();
$gridfield = new GridField("Fotos", "Fotos", $this->Fotos(), $gridFieldConfig);
$fields->addFieldToTab('Root.GalleryImages', $gridfield);

return $fields;      
}

}
class PhotoPagina_Controller extends Page_Controller {

   public static $allowed_actions = array (
   );

   public function init() {
      parent::init();
Requirements::themedCSS('jquery-ui');
Requirements::themedCSS('fotoalbum');
Requirements::themedCSS('jquery-fancybox-1.2.6');
Requirements::JavaScript('http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js');
Requirements::JavaScript('themes/nkwa/javascript/fancybox/jquery.fancybox-1.2.6.pack.js');
Requirements::JavaScript('themes/nkwa/javascript/vendor/fotoalbum.js');
   }
...
}

class Photo extends DataObject {

static $db = array(

);
static $has_one = array(
'Plaatje' => 'Image',
'FotoPagina' => 'PhotoPagina'   
);

public function getCMSFields() {
      $fields = parent::getCMSFields();
      $fields->removeFieldFromTab("Root.Main","PhotoPaginaID");
      return $fields;      
}

public static $summary_fields = array(
'ID' => 'ID',
    'Thumbnail' => 'Thumbnail'
);

public function getThumbnail() {
return $this->Image()->CMSThumbnail();
}
}