[fw-mvc] [Zend_Form] howto: multiCheckbox with collapsible lower elements‏

I create a series of checkboxes in a multiCheckbox element from Zend_Form. These checkboxes are rendered in one definition list.
Since this list is to long, I want to be able to collapse the lower part of the list.

I can imagine two solutions.

1. Generate two different definition lists, put adiv in between
2. Generate a single definition list, with the lower part nested in a dd. Example:
   

 <dl> 	<dt>one</dt> 	<dd>checkbox</dd> 	<dt>two</dt> 	<dd>checkbox</dd> 	<dt>..</dt> 	<dd>checkbox</dd> 	<dt>show more</dt> 	<dd> 		<dl> 			<dt>six</dt> 			<dd>checkbox</dd> 			<dt>seven</dt> 			<dd>checkbox</dd> 			<dt>..</dt></dd> 		</dl> </dl> 

I don't know what is semantically more correct.
Anyways, my question is: how can I solve this in Zend_Form?

1. Is this what displaygroups are for?
2. Do I need to extend the FormElements decorator? How? With a different View script?
3. other way...?
   

I am a bit puzzled by the complexity and possibilities of Zend_Form. What is best practice? Any help is greatly appreciated.

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