Matthias\SymfonyConsoleForm\Console\Helper\Question\AlwaysReturnKeyOfChoiceQuestion::setMultiselect PHP Method

    public function setMultiselect($multiselect)
    {
        $this->_multiselect = $multiselect;
        return parent::setMultiselect($multiselect);
    }

 public function transform(Form $form)
 {
     $formView = $form->createView();
     $question = new AlwaysReturnKeyOfChoiceQuestion($this->questionFrom($form), $formView->vars['choices'], $this->defaultValueFrom($form));
     if ($form->getConfig()->getOption('multiple')) {
         $question->setMultiselect(true);
     }
     return $question;
 }