protected function renderCloseButton()
{
if (($closeButton = $this->closeButton) !== false) {
$tag = ArrayHelper::remove($closeButton, 'tag', 'button');
$label = ArrayHelper::remove($closeButton, 'label', '×');
Html::addCssClass($closeButton, ['close' => 'modal-close']);
if ($tag === 'button' && !isset($closeButton['type'])) {
$closeButton['type'] = 'button';
}
return Html::tag($tag, $label, $closeButton);
} else {
return null;
}
}