Phalcon\Forms\Element\Radio not selected when submit return

Hi all, I'm working with From radio group, I want to select boolen 1 or 0

$enable = new \Phalcon\Forms\Element\Radio("enable", ['name' => 'enable', 'value' => '1']);
$enable->setLabel('Enable:');
$hidden = new \Phalcon\Forms\Element\Radio("hidden", ['name' => 'enable', 'value' => '0']);
$hidden->setLabel('Hidden:');

In view

<div class="form-group"> {{ form.label('enable') }} {{ form.render('enable') }} {{ form.label('hidden') }} {{ form.render('hidden') }} </div>

In controller

if ($this->request->isPost()) {
    $params = $this->request->getPost();

    if ($form->isValid($params) == true) {
        //true
    } else {
        $messages = $form->getMessages();
    }
}

I tried to submit to return to the page current, but the value 0 is not selected. I using phalcon v2.1. Please help me