public function findParentNodesByChildId($id)
	{
        // To be returned
        $result = array();

        $rl = $this->getRelations();
        $data = $rl[RelationBuilder::TREE_PARAM_ITEMS];

        // If can't find, then return empty array
        if (!isset($data[$id])) {
            return array();
        }

        $current = $data[$id];
        $parentId = $current[RelationBuilder::TREE_PARAM_PARENT_ID];

        while (isset($data[$parentId])) {
            $current = $data[$parentId];
            $parentId = $current[RelationBuilder::TREE_PARAM_PARENT_ID];

            array_push($result, $current);
        }

        return $result;
    }