$select = $row->select();
$select->order('item_name');
$row->findDependentRowset($table, null, $select)

$select = $row->select()->limit($itemCountPerPage,$offset);
$select->order('item_name');
$row->findDependentRowset($table, null, $select);

public function getItems($offset, $itemCountPerPage)
{
   $this->_select->limit($itemCountPerPage, $offset);
   return $this->_select;
}