public function radio($label, $name, $value = null)
{
if (is_null($value)) {
$value = $label;
}
$control = $this->builder->radio($name, $value);
$checkGroup = $this->checkGroup($label, $name, $control)->addClass('radio');
return new OffsetFormGroup($this->wrap($checkGroup), $this->columnSizes);
}