/**
  * @return Form
  */
 public function SearchForm()
 {
     $form = new Form($this, 'SearchForm', $this->context->getFields(), new FieldList(FormAction::create('doSearch', _t('GridFieldExtensions.SEARCH', 'Search'))->setUseButtonTag(true)->addExtraClass('ss-ui-button')->setAttribute('data-icon', 'magnifier')));
     $form->addExtraClass('stacked add-existing-search-form');
     $form->setFormMethod('GET');
     return $form;
 }