zendframework/zf2 — pull request #4179 by Chintanvpatel (2013-04-04 11:48:05+00:00)
Title: Radio & Multicheckbox Problem with selected & disabled attributes

Please refer this issue
https://github.com/zendframework/zf2/issues/4136

From this fix we can do (disable whole group of radio & multicheckbox)
$form->get('gender')->setAttribute('disabled', 'true');