gtk2-perl-xs - changing textview fonts

I just downloaded gtk2-perl-xs from CVS yesterday, hoping to translate one of
my old gtk-based C programs into perl, and am at a loss as to how to get a 
Gtk2::TextView to use a fixed font (Courier 12 would be just fine). I'm a
newbie to both perl and gtk2, so any hand-holding would be greatly appreciated.
-- 
Traveling Geologist