[pygtk] gtk.Entry / gtk.Completion behavior -- can I change it?

[Chris Gonnerman]

I have an application with a form, very vanilla, and some of the 
gtk.Entry fields have attached gtk.Completions to make life easier for 
my users (who happen to work for me).  When working the form entirely 
from the keyboard, selecting an item requires arrowing down to it (after 
the gtk.Completion list appears), then pressing Return.  My users are 
accustomed to the Windows standard behavior, where pressing Tab after 
highlighting the target item inserts it into the field, then passes 
focus to the next field.

I've banged my head against Google for a few hours now, and can't figure 
out any reasonable way to change this behavior.  Have I missed something?

-- Chris.