public function prepareSave(Kwf_Model_Row_Interface $row, $postData)
 {
     if ($this->_latitudeFieldname && $this->_longitudeFieldname) {
         if ($this->getSave() !== false) {
             $coords = explode(';', $this->_getValueFromPostData($postData));
             if (isset($coords[0]) && isset($coords[1])) {
                 $row->{$this->_latitudeFieldname} = $coords[0];
                 $row->{$this->_longitudeFieldname} = $coords[1];
             }
         }
     } else {
         return parent::prepareSave($row, $postData);
     }
 }