public function getLabeledColumns()
    {
        if (!$this->model->hasMeta('labeledColumns')) {
            $orderedCols = $this->model->getItemsOrdered();

            $results = array();
            foreach ($orderedCols as $name) {
                if ($this->model->has($name, 'label')) {
                    $results[] = $name;
                }
            }

            $this->model->setMeta('labeledColumns', $results);
        }

        return $this->model->getMeta('labeledColumns');
    }