"Hook" gtk_file_chooser's directory creation

["Rick Helmus" <rhelmus gmail com>]

Hello all

I'm trying to 'hook' the directory creation from a gtk_file_chooser in
order to let the user create directories as root. Basicly I want to
check if the user has the permission to create the directory, and if
not ask the user for a root password.

So I'm wondering if it's possible to extend this widget, for example
by passing my own directory create function?

Cheers, Rick