public function updateEditForm(CMSForm &$form)
 {
     $fields = $form->Fields();
     $class = $this->owner->modelClass;
     $o = singleton($class);
     $gf = $form->Fields()->dataFieldByName($class);
     $config = $gf->getConfig();
     // If we have the bulk manager, enable by default
     if (class_exists('GridFieldBulkManager')) {
         if ($o->hasMethod('bulkManagerDisable') && $o->bulkManagerDisable) {
         } else {
             $config->addComponent($bulkManager = new GridFieldBulkManager());
             if ($o->hasMethod('bulkManagerAdd')) {
                 $actions = $o->bulkManagerAdd();
                 foreach ($actions as $key => $action) {
                     $bulkHandler = isset($action['Handler']) ? $action['Handler'] : null;
                     $bulkConfig = isset($action['Config']) ? $action['Config'] : null;
                     $bulkManager->addBulkAction($action['Name'], $action['Label'], $bulkHandler, $bulkConfig);
                 }
             }
         }
     }
     // If we have the export all button (form-extras module), enable
     if (class_exists('GridFieldExportAllButton')) {
         $config->addComponent(new GridFieldExportAllButton('before'));
     }
     if (!Director::isDev() || !Permission::check('ADMIN')) {
         return;
     }
     // Add buttons
     $config->addComponent(new GridFieldButtonRow('after'));
     $config->addComponent($btnEmpty = new DevToolkitEmptyButton('buttons-after-left'));
     if ($o->hasMethod('provideFake')) {
         $config->addComponent($btnAddFake = new DevToolkitAddFakeButton('buttons-after-left'));
     }
     if ($o->hasExtension('GeoExtension')) {
         $config->addComponent($btnAddFake = new DevToolkitFakeLocationsButton('buttons-after-left'));
     }
     $config->addComponent($btnDump = new DevToolkitDumpButton('buttons-after-left'));
     // Show session message
     $message = self::SessionMessage();
     if ($message) {
         $fields->insertBefore(new LiteralField("dev_message", "<div class='message {$message->Type}'>{$message->Content}</div>"), $gf->getName());
     }
 }