Kdyby/FormsBootstrapRendererExtension — pull request #2 by george-oakling (2012-08-01 06:25:17+00:00)
Title: Add id attribute for fieldset (group), useful for group toggling.

Useful for toggling particular groups, for example:

$form->addRadioList('radio', 'Select', array(
1 => 'Group 1',
2 => 'Group 2'))
->addCondition(Form::EQUAL, 1)
->toggle('group1')
->addCondition(Form::EQUAL, 2)
->toggle('group2');

$form->addGroup('Group 1')->setOption('id', 'group1');
$form->addGroup('Group 2')->setOption('id', 'group2');

etc.