code: public function render(CollectionContainer $container, $layout = Form::LAYOUT_HORIZONTAL, $parameter = [])
      {
          $view = $this->getView();
          $view->headscript()
              ->appendFile($view->basepath('modules/Core/js/jquery.formcollection-container.js'));
          $translator = $this->getTranslator();
          $formContainerHelper = $view->formContainer();
          $formsMarkup = '';
          $formTemplateWrapper = '<div class="form-collection-container-form">
              '. ($this->displayRemoveButton ? '<button type="button" class="btn btn-sm btn-danger pull-right form-collection-container-remove-button">' . $translator->translate('Remove') . '</button>' : '') . '
              %s
          </div>';
          
          foreach ($container as $form) /* @var $form \Zend\Form\Form */
          {
              $formsMarkup .= sprintf($formTemplateWrapper, $formContainerHelper->renderElement($form, $layout, $parameter));
          }
          
          $templateForm = $container->getTemplateForm();
          $templateMarkup = sprintf(
              $view->formCollection()->getTemplateWrapper(),
              $view->escapeHtmlAttr(sprintf($formTemplateWrapper, $formContainerHelper->renderElement($templateForm, $layout, $parameter)))
          );
          
          return sprintf(
              '<div class="form-collection-container" data-new-entry-key="%s" data-remove-action="%s" data-remove-question="%s">
                  <h3>%s</h3>
                  %s%s%s
              </div>',
              CollectionContainer::NEW_ENTRY,
              $container->formatAction('remove'),
              $translator->translate('Really remove?'),
              $container->getLabel(),
              $formsMarkup,
              $templateMarkup,
              '<div class="form-collection-container-add-wrapper"><button type="button" class="btn btn-success form-collection-container-add-button"><span class="yk-icon yk-icon-plus"></span> ' . sprintf($translator->translate('Add %s'), $container->getLabel()) . '</button></div>'
          );
      }
docs: Renders the forms of a container.
  
  @param CollectionContainer $container
  @param string $layout
  @param array $parameter
  @return string