GtkTreeView not scrolling

[Chris Seaton <chris chrisseaton com>]

I have a GtkTreeView (backed by a GtkListStore if that is significant) 
that is the main widget in my main window. The tree view expands to show 
every item so that when I have a hundred items the window is so huge 
that it goes right off the screen. How do I tell Gtk to make the window 
scroll and not try to fit every item in by resizing?

Thanks.

Chris Seaton