function _cm_getInitialDataMultiple ($fieldarray)
{
    $parent_data = $fieldarray;
    $fieldarray = array();  // clear current data

    while (...)
        // create initial data for first row
        $row = $this->_cm_getInitialData($parent_data);
        $row['field1'] = 'whatever';
        $row['field2'] = 'whatever';
        $fieldarray[] = $row;
    } // while

    return $fieldarray;

} // _cm_getInitialDataMultiple