Index: branches/RC/core/units/general/cat_event_handler.php
===================================================================
diff -u -N -r10459 -r10516
--- branches/RC/core/units/general/cat_event_handler.php	(.../cat_event_handler.php)	(revision 10459)
+++ branches/RC/core/units/general/cat_event_handler.php	(.../cat_event_handler.php)	(revision 10516)
@@ -396,10 +396,7 @@
 			return false;
 		}
 
-		$sql = 'SELECT TreeLeft, TreeRight
-				FROM '.TABLE_PREFIX.'Category
-				WHERE CategoryId = '.$category_id;
-		$tree_indexes = $this->Conn->GetRow($sql);
+		$tree_indexes = $this->Application->getTreeIndex($category_id);
 
 		return TABLE_PREFIX.'Category.TreeLeft BETWEEN '.$tree_indexes['TreeLeft'].' AND '.$tree_indexes['TreeRight'];
 	}