public function getChildIds($select = array())
    {
        $select = $this->_formatSelect($select);
        if (!$select->hasPart(Kwf_Component_Select::WHERE_GENERATOR)) {
            throw new Kwf_Exception('Only one generator supported, please restrict select to a generator');
        }
        $generator = current(Kwf_Component_Generator_Abstract::getInstances($this, $select));
        return $generator->getChildIds($this, $select);
    }