protected function _getResource()
{
if (is_null($this->childMode)) {
return parent::_getResource();
}
if (empty($this->_resourceName)) {
Mage::throwException(Mage::helper('core')->__('Resource is not set.'));
}
$arguments = array('child_mode' => $this->childMode);
return Mage::getResourceModel($this->_resourceName, $arguments);
}
