Index: branches/RC/core/units/categories/categories_event_handler.php
===================================================================
diff -u -N -r10428 -r10516
--- branches/RC/core/units/categories/categories_event_handler.php	(.../categories_event_handler.php)	(revision 10428)
+++ branches/RC/core/units/categories/categories_event_handler.php	(.../categories_event_handler.php)	(revision 10516)
@@ -180,10 +180,7 @@
 			if ($event->getEventParam('recursive')) {
 				if ($parent_cat_id > 0) {
 					// not "Home" category
-					$sql = 'SELECT TreeLeft, TreeRight
-							FROM '.TABLE_PREFIX.'Category
-							WHERE CategoryId = '.$parent_cat_id;
-					$tree_indexes = $this->Conn->GetRow($sql);
+					$tree_indexes = $this->Application->getTreeIndex($parent_cat_id);
 
 					$object->addFilter('parent_filter', TABLE_PREFIX.'Category.TreeLeft BETWEEN '.$tree_indexes['TreeLeft'].' AND '.$tree_indexes['TreeRight']);
 				}