In general you have to handle SetContentOnCenterPlace in all ActivityMappers 
and in case of the west activity mapper return a new menu activity again (or 
a cached one). I do not know your places but maybe a FilteredActivityMapper 
can also help (it can be used to map one place to another so that your 
ActivityMapper returns a different activity).

But I found it easier to not use Activities/Mappers for areas that are 
static and always visible, such as menus. I would put the menu 
directly  (<g:HyperLink targetHistoryToken="....">....</g:HyperLink>) into 
the west area of the DockLayoutPanel and let the AppPresenter or whatever 
you use to manage the outer app listen for PlaceChangeEvents so you are able 
to highlight the corresponding menu item for a given place.

-- J.

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