menubar alignment question

[Allin Cottrell <cottrell wfu edu>]

Using GtkItemFactory one could push a certain menu to the 
right-hand end of a menubar (i.e. right-justify it) using the 
"<LastBranch>" tag.  This was useful, e.g., for making a "Help" 
menu stand out.

Is there any way to do this when creating a menubar with 
GtkUIManager?  I tried putting in a

<separator expand='true'/>

before the last item, but this didn't do anything useful (it 
inserted a minuscule horizontal line before the item).

-- 
Allin Cottrell
Department of Economics
Wake Forest University, NC