protected function deleteProductCategories($demoId)
 {
     $query = new Am_Query(new ProductCategoryTable());
     $query->add(new Am_Query_Condition_Field('code', 'LIKE', $demoId . ':%'));
     $count = $query->getFoundRows() ? $query->getFoundRows() : 1;
     foreach ($query->selectPageRecords(0, $count) as $pCategory) {
         $pCategory->delete();
     }
 }