Twitter bootstrap: Nested fieldsets?
===

I need to get something like this done in a way that I can use twitter bootstrap.

    <fieldset>
    	<legend>Main Section</legend>
    	<div class="left-column">
    		some stuff here
    	</div>
    	<div class="right->column">
    		<fieldset>
    			<legend>A form inside</legend>
    			form here
    		</fieldset>
    	</div>
    </fieldset>

Bootstrap is for some reason styling the fieldsets different than usual without a border. If I add a border and some padding I can't work any longer properly with the grid. The result always screwed up for me. I need the fieldset to look like in the mockup with the border, some padding and the label inside the border (well thats easy ;)).

So whats the best way to get this done by using bootstrap and following its principles?

![Example][1]

  [1]: http://i.stack.imgur.com/cHF12.png