Manager/FormManager.php
public function delete($id, $locale = null)
    {
        $object = $this->findById($id, $locale);

        if (!$object) {
            return;
        }

        $this->entityManager->remove($object);
        $this->entityManager->flush();

        return $object;
    }
public function delete($id, $locale = null)
    {
        $object = $this->findById($id, $locale);

        if (!$object) {
            return;
        }

        $this->entityManager->remove($object);
        $this->entityManager->flush();

        return $object;
    }
@param int $id
@param string $locale

@return Form|null