Re: SS3 GridFieldSortableRows() module

class BannerAdmin extends ModelAdmin {

public static $managed_models = array(
'Banner',
);

static $url_segment = 'Banners'; // will be linked as /admin/products
static $menu_title = 'Banners';

function getEditForm($id = null, $fields = null) {
      $list = $this->getList();
      $exportButton = new GridFieldExportButton('before');
      $exportButton->setExportColumns($this->getExportFields());
      $listField = GridField::create(
         $this->modelClass,
         false,
         $list,
         $fieldConfig = GridFieldConfig_RecordEditor::create($this->stat('page_length'))
            ->addComponent($exportButton)
            ->removeComponentsByType('GridFieldFilterHeader')
            ->addComponents(new GridFieldPrintButton('before'))
       ->addComponent(new GridFieldSortableRows('SortOrder')) //add your extra components here
      );

      // Validation
      if(singleton($this->modelClass)->hasMethod('getCMSValidator')) {
         $detailValidator = singleton($this->modelClass)->getCMSValidator();
         $listField->getConfig()->getComponentByType('GridFieldDetailForm')->setValidator($detailValidator);
      }

      $form = new Form(
         $this,
         'EditForm',
         new FieldList($listField),
         new FieldList()
      );
      $form->addExtraClass('cms-edit-form cms-panel-padded center');
      $form->setTemplate($this->getTemplatesWithSuffix('_EditForm'));
      $form->setFormAction(Controller::join_links($this->Link($this->modelClass), 'EditForm'));
      $form->setAttribute('data-pjax-fragment', 'CurrentForm');

      $this->extend('updateEditForm', $form);
      
      return $form;
   }

}