gistfile1.txt

        $options = array();

        if ($data->getBlah()) {
            $options = array(
                'disabled' => true
            );
        }
        else {
            $options = array(
                'required' => false
            );
        }

        $type = $this->factory->createNamed('bank_account', new BankAccountType(), $options);
        $form->add($type);