fix

@@ -52,9 +52,9 @@ var g = new common.grid({
         var studentPriceValScope = $("#studentPriceValScope").val();       
         return {
             product_skn: common.util.__input("skn"),
-            max_sort_id: select[0] ? select[0].id : "",
-            middle_sort_id: select[1] ? select[1].id : "",
-            small_sort_id: select[2] ? select[2].id : "",
+            max_sort_id: tabTree.select[0] ? tabTree.select[0].id : "",
+            middle_sort_id: tabTree.select[1] ? tabTree.select[1].id : "",
+            small_sort_id: tabTree.select[2] ? tabTree.select[2].id : "",
             shop_id: common.util.__input("shop"),
             brand_id: common.util.__input("brand"),
             studentPriceValScope: studentPriceValScope