/**
* @author Jeff Ober
* @param string $label the field's text label
* @param array $validators a list of callbacks to validate the field data
* @param array $attributes a list of key/value pairs representing HTML attributes
**/
public function __construct($label, array $validators = array(), array $attributes = array())
{
parent::__construct($label, $validators, $attributes);
parent::set_value('on');
$this->checked = false;
}
