public function renderItem($index, $label, $name, $checked, $value)
{
$labelOptions = $this->labelOptions;
Html::addCssClass($labelOptions, 'btn');
if ($checked) {
Html::addCssClass($labelOptions, 'active');
}
$type = $this->type;
if ($this->encodeLabels) {
$label = Html::encode($label);
}
return Html::$type($name, $checked, ['label' => $label, 'labelOptions' => $labelOptions, 'value' => $value]);
}