[fw-mvc] [Zend_Form] nest a DisplayGroup as defintion list inside an other definition list

I have a form and I need some grouping for several fields. For this we have
DisplayGroups. I want this displaygroup not rendered as a fieldset, but just
a plain definition list.
However, I am not able to get so far.

The desired output
---------------------------------------------
dt normal field label
dd normal field element
dt my 'legend' text for a display group
- dd
- dfn
dt display-group element label 1
dd display-group element element
dt ...
dt ...
---------------------------------------------

I am inclined to think I could get this by

$form->addElements(..);
$form->addDisplayGroup(..., array(
'label' => "my 'legend' text for a display group"
'decorators' => array('FormElements', 'DtDdWrapper')
));

this doen't work. Over at
http://www.nabble.com/-Zend_Form--Nested-DisplayGroups-td16834788.html#a16834788
this thread it is mentioned that for nesting one should use SubForms.
Is this valid in this context?
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