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

    public function getControl()
    {
        $input = parent::getControl();
        $items = $this->getItems();
        $ids = [];
        if ($this->generateId) {
            foreach ($items as $value => $label) {
                $ids[$value] = $input->id . '-' . $value;
            }
        }
        return $this->container->setHtml(Nette\Forms\Helpers::createInputList($this->translate($items), array_merge($input->attrs, ['id:' => $ids, 'checked?' => $this->value, 'disabled:' => $this->disabled, 'data-nette-rules:' => [key($items) => $input->attrs['data-nette-rules']]]), ['for:' => $ids] + $this->itemLabel->attrs, $this->separator));
    }

 /**
  * @internal
  * @param \Nette\Forms\Controls\RadioList $control
  * @return bool
  */
 public static function getRadioListItems(Controls\RadioList $control)
 {
     $items = array();
     foreach ($control->items as $key => $value) {
         $el = $control->getControl($key);
         if ($el->getName() === 'input') {
             $items[$key] = $radio = (object) array('input' => $el, 'label' => $cap = $control->getLabel(NULL, $key), 'caption' => $cap->getText());
         } else {
             $items[$key] = $radio = (object) array('input' => $el[0], 'label' => $el[1], 'caption' => $el[1]->getText());
         }
         $radio->label->addClass('radio');
         $radio->html = clone $radio->label;
         $radio->html->insert(0, $radio->input);
     }
     return $items;
 }