public function configure(Form $form)
 {
     $form->addText('text', 'Text');
     $form->addText('priceFrom', 'Price from');
     $form->addText('priceTo', 'Price to');
     $form->addCheckboxList('labels', 'Labels')->setItems($this->getLabels(), FALSE);
     $form->addSaveButton('Apply');
 }