Yes I answered too fast without reading your answer !
Your solution is by far simpler.
I see that a DockingBarUpdatingMenuMorph always rebuild its menu as
the name tells

Nicolas

2013/1/22 Bert Freudenberg <bert at freudenbergs.de>:
> But it gets rebuilt every time it is shown anyway, so why bother making it weak?
>
> - Bert -
>
> On 22.01.2013, at 13:58, Nicolas Cellier <nicolas.cellier.aka.nice at gmail.com> wrote:
>
>> If the menu points weakly, then it should be OK.
>> See Morphic-nice.635 in inbox.
>>
>> Nicolas
>>
>> 2013/1/22 Bert Freudenberg <bert at freudenbergs.de>:
>>>
>>> On 22.01.2013, at 13:31, "H. Hirzel" <hannes.hirzel at gmail.com> wrote:
>>>> What should we do about the 'Windows' subMenu?
>>>>
>>>> Rebuild it any time a menu is called? Or rebuild it any time a window is closed?
>>>
>>>
>>> Nil it out as soon as the window is closed. Perhaps like this?
>>>
>>> DockingBarUpdatingMenuMorph>>outOfWorld: aWorld
>>>        self removeAllMorphs.   "forget references held in menu items"
>>>        ^super outOfWorld: aWorld
>>>
>>>
>>> - Bert -
>>>
>>>
>>>
>>
>
>
>