Problem with + and - keys in Tree widget

[Preben Randhol <randhol pvv org>]

The "normal" + and - keys do not work with the Tree widget to close
and open a branch. The + and - on the numerical pad does though. 

I have a normal keyboard with Norwegian layout and I'm using no-latin1
kbd setting. When I try in a GTk app to press +, nothing happens. If I
press - it works, but I guess that is coincidence. 

Is this fixable? 

System: Intel x86 with Redhat 6.x and Linux 2.2.x 
-- 
Preben Randhol                 Affliction is enamoured of thy parts, 
[randhol@pvv.org]              And thou art wedded to calamity. 
[http://www.pvv.org/~randhol/]                    -- W. Shakespeare