protected function prepareAssocArrayForExport()
 {
     foreach ($this->treeFieldValues as $treeItemSID) {
         $treeItemHierarchyDisplayValues = SJB_ListingFieldTreeManager::getTreeDisplayValuesBySIDForExport($treeItemSID);
         $this->fillAssocArray($treeItemHierarchyDisplayValues, $this->valuesForXml);
     }
 }