Index: NSOutlineView.m
===================================================================
--- NSOutlineView.m	(revision 24482)
+++ NSOutlineView.m	(working copy)
@@ -449,6 +449,7 @@
   id object = (item == nil) ? (id)[NSNull null] : (id)item;
   NSArray *allKeys = NSAllMapTableKeys(_itemDict);
   NSEnumerator *en = [allKeys objectEnumerator];
+  NSRect rectOfItem, rectOfLastRow;
 
   expanded = [self isItemExpanded: item];
 
@@ -485,8 +486,19 @@
 	  [self _openItem: dsobj];
 	  [self noteNumberOfRowsChanged];
 	}
-    }      
-  [self setNeedsDisplay: YES];
+    }     
+  
+  rectOfItem = [self rectOfRow:[self rowForItem:item]];
+
+  if (reloadChildren && expanded)
+    {
+      rectOfLastRow = [self rectOfRow:_numberOfRows - 1];
+      [self setNeedsDisplayInRect:NSUnionRect(rectOfItem, rectOfLastRow)];
+    }
+  else
+    {
+      [self setNeedsDisplayInRect: rectOfItem];
+    }
 }
 
 /**