<?php
//controller code:
$stuff = $this->MyTreeBehaviorModel->find('all', 
     array('fields' => array('whatever', 'lft', 'rght'), 'order' => 'lft ASC'));
//view code
// pass the data for each node to /views/elements/thisone.ctp and put the results in the rendered UL
echo $tree->generate($stuff, array('element' => 'thisone'));