public static function processDropdown(&$element, FormStateInterface $form_state, &$complete_form) {
    if (count($element['#options']) > 0) {
      $weight = 0;
      foreach ($element['#options'] as $key => $option) {
        $value = HtmlUtility::escape($option['value']);
        $label = HtmlUtility::escape($option['label']);
        $description = isset($option['description']) ? HtmlUtility::escape($option['description']) : NULL;

        // Maintain order of options as defined in #options, in case the element
        // defines custom option sub-elements, but does not define all option
        // sub-elements.
        $weight += 0.001;

        $element += [$key => []];
        // Generate the parents as the autogenerator does, so we will have a
        // unique id for each radio button.
        $parents_for_id = array_merge($element['#parents'], [$key]);
        $element[$key] += [
          '#type' => 'radio',
          '#title' => $label,
          '#description' => $description,
          // The key is sanitized in Drupal\Core\Template\Attribute during
          // output from the theme function.
          '#return_value' => $value,
          // Use default or FALSE. A value of FALSE means that the radio button
          // is not 'checked'.
          '#default_value' => isset($element['#default_value']) ? $element['#default_value'] : FALSE,
          '#attributes' => $element['#attributes'],
          '#parents' => $element['#parents'],
          '#id' => HtmlUtility::getUniqueId('edit-' . implode('-', $parents_for_id)),
          '#ajax' => isset($element['#ajax']) ? $element['#ajax'] : NULL,
          // Errors should only be shown on the parent radios element.
          '#error_no_message' => TRUE,
          '#weight' => $weight,
        ];
      }
    }

    return $element;
  }