Fix the "additional items" button in the toolbar to not be bordered.

AppKit/CPToolbar.j

@@ -373,6 +373,7 @@ var _CPToolbarItemInfoMake = function(anIndex, aView, aLabel, aMinWidth)
         [self setBackgroundColor:_CPToolbarViewBackgroundColor];
         
         _additionalItemsButton = [[CPPopUpButton alloc] initWithFrame:CGRectMake(0.0, 0.0, 10.0, 15.0) pullsDown:YES];
+        [_additionalItemsButton setBordered:NO];
 
         [_additionalItemsButton setImagePosition:CPImageOnly];
         [[_additionalItemsButton menu] setShowsStateColumn:NO];