The Bakery Everything CakePHP

hello,
i tried to change how checkbox markup are displayed when multiple option is set to checkbox, but nothing works, i tried: 'multiple.checkbox', and 'multiple'=>array('checkbox') on key of tags array at tags.php; but dont works, anyone have some tips to share?

thanks in advance!

if i am right in method getData need call $this->init() to load values in session otherwise the $data always empty.

waiting reply... thanks!!!!