sonata-project/SonataAdminBundle — pull request #2179 by zhil (2014-06-09 18:46:17+00:00)
Title: #1723

@rande #1723 added prototype for code like
```
$formMapper
->with('tab1', array('tab'=>true))
->with('group1')
->add('username')
->add('password')
->end()
->with('group2', array('collapsed' => true))
->add('enabled')
->add('createdAt')
->end()
->end();
```