Alt-key mnemonics in menus

[Allin Cottrell <cottrell wfu edu>]

I've noticed that in my GTK app Alt-key mnemonics work like 
this: pressing Alt-F, for example, opens the _File menu, but 
once you're in the menu pressing Alt-N does not activate _New, 
although pressing plain N does so.

In various other GTK apps both Alt-N and plain N work in this 
sort of context.

Any idea on what might account for the difference? I'm 
wondering if I've inadvertantly done something that disables 
Alt-key within menus but I don't know what that could be.

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