Trouble getting orderBy = 'display_desc' working in auto_nav breadcrumbs

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Hi There,

This particular site I'm working on requires the breadcrumbs to work as a kinda "You are here" section which works better if the order of the crumb items could be reversed.

I've changed the auto_nav call to this:
<ul class="breadcrumb">
  <li>YOU ARE HERE:   </li>
  <?php
    $bt_main = BlockType::getByHandle('autonav'); 
    $bt_main->controller->displayPages = 'top'; 
    $bt_main->controller->orderBy = 'display_desc'; // display_asc, display_desc, chrono_asc, chrono_desc, alpha_desc
    $bt_main->controller->displaySubPages = 'relevant_breadcrumb';
    $bt_main->controller->displaySubPageLevels = 'all';  
    $bt_main->controller->displayPagesIncludeSelf = 1; 
    $bt_main->render('templates/bs_crumbs'); 
  ?>
</ul>


I've checked the order of the output markup incase I was floating the crumb li's but I can't seem to get the crumbs outputting the opposite way if that makes sense.

Does anyone know what I might be doing wrong?

Cheers

Ben