[Seaside] Menu building pattern?

[C. David Shaffer]

I have been working on a generic menu component and I'm stumbling on 
managing children.  What I'd like to do is after callback processing is 
complete (and the component tree is finalized for the next rendering 
pass), traverse the tree and ask each visible presenter for its menu 
items.  The menu items themselves are components so they have to appear 
in the menu's response to #children during the next render loop 
iteration.  I've made several false starts and I'm getting myself 
confused.  One thing that I thought might work was to change my menu 
into a decoration of the root component and then to have it override 
WAPresenter>>processCallbackStream: as such

processCallbackStream: aCallbackStream
    super processCallbackStream: aCallbackStream.
    self rebuild

where rebuild just uses "owner visiblePresentersDo: " to walk the 
presenter list and build the menu items.  I end up with unprocessed 
callbacks whenever I trigger the menu items' links.  Am I thinking about 
the order of things correctly here?  Anyone doing anything like this?

David