Selecting folders with GtkFileChooser

["Dan H." <dunno stoptrick com>]

Hello,
how can I set up a GtkFileChooser so that users can select a folder rather
than a file? As it is, one selects a a folder and clicks "open" (hoping to
select that folder), but rather than returning that folder's path, the
dialog just opens the folder and shows its contents.

How can this be changed? I couldn't find anything in the GTL API, which is
puzzling since this is a common occurence.

--D.