Nette\Forms\Controls\CheckboxList::getControl PHP Method

    public function getControl()
    {
        $input = parent::getControl();
        $items = $this->getItems();
        reset($items);
        return $this->container->setHtml(Nette\Forms\Helpers::createInputList($this->translate($items), array_merge($input->attrs, ['id' => NULL, 'checked?' => $this->value, 'disabled:' => $this->disabled, 'required' => NULL, 'data-nette-rules:' => [key($items) => $input->attrs['data-nette-rules']]]), $this->label->attrs, $this->separator));
    }