<?php
public function index(){
    $this->loadModel('Model');
    $this->set('data',$this->Model->generateTreeList());
}
?>

<?php
echo '<ul data-role="listview" data-divider-theme="a" data-inset="true">';
echo $this->TreeView->createTree($data,array('controller'=>'Categorias','action'=>'view'));
echo '</ul>';
?>

<?php
App::uses('AppHelper', 'View/Helper');
class TreeLiHelper extends AppHelper {
    public $helpers = array('Html');
    public $link;
    public function createTree($tree,$link){
            $this->link = $link;
            $out = '';
            $count = 0;
            $buffer = null;
            foreach($tree as $id => $item){
                    $depth = strrpos($item, '_');
                    if ($depth === false) {
                            $depth = 0;
                            $clean_item = $item;
                    } else {
                            $depth = $depth + 1;
                            $clean_item = substr($item, strrpos($item, '_')+1);
                    }
                    if($buffer != null){
                            $out .= $this->makeLi($buffer,$depth,$id);
                    }
                    $buffer['item'] = $clean_item;
                    $buffer['depth'] = $depth;
            }
            $out .=$this->makeLi($buffer,0,$id);
            return $out;
    }

    protected function makeLi($buffer,$depth,$id){
            if($buffer['depth']==$depth){
                    $out = '<li>'.$this->makeLabel($buffer['item'],$id)."</li>\n";
            }elseif($buffer['depth']<$depth){
                    $out = '<li>'.$this->makeLabel($buffer['item'])."\n<ul>\n";
            }elseif($buffer['depth']>$depth){
                    $out = "<li>".$this->makeLabel($buffer['item'],$id)."</li>\n";
                    $diff = $buffer['depth']-$depth;
                    for($i=0; $i<$diff;$i++){
                            $out .= "</ul> \n </li>\n";
                    }

            }
            return $out;
    }

    protected function makeLabel($item, $id = null){
            if($id!=null){
                    $return = $this->Html->link($item, $this->mountLink($id));
            }else{
                    $return = $item;
            }
            return $return;
    }

    protected function mountLink($id){
            if(is_array($this->link)){
                    $link = $this->link;
                    $link[] = $id;
            }else{
                    $link = rtrim($this->link,'/').'/'.$id;
            }
            return $link;
    }

}
?>