src/Form/WizardContainer.php
public function getForm($key, $asInstance = true)
    {
        $form = parent::getForm($key, $asInstance);
        
        /*
         * We must check here, if a lazy loaded top level form is an
         * instance of Container.
         */
        if ($asInstance && false === strpos($key, '.') && (!$form instanceof Container || !$form->getLabel())) {
            throw new \UnexpectedValueException(sprintf(
                                                    'The registered form with key "%s" is not an instance of \Core\Form\Container or does not have a label.',
                                                    $key
                                                ));
        }

        return $form;
    }
public function getForm($key, $asInstance = true)
    {
        $form = parent::getForm($key, $asInstance);
        
        /*
         * We must check here, if a lazy loaded top level form is an
         * instance of Container.
         */
        if ($asInstance && false === strpos($key, '.') && (!$form instanceof Container || !$form->getLabel())) {
            throw new \UnexpectedValueException(sprintf(
                                                    'The registered form with key "%s" is not an instance of \Core\Form\Container or does not have a label.',
                                                    $key
                                                ));
        }

        return $form;
    }
Gets a specific formular.

This formular will be created upon the first retrievement.
If created, the formular gets passed the formular parameters set in this container.

@see Container::getForm

@param string $key
@param bool   $asInstance if false, the specification array is returned.

@return Container|null|\Zend\Form\FormInterface|array
@throws \UnexpectedValueException