Context menus for GtkTreeView

[Dave Malcolm <david davemalcolm demon co uk>]

I'm porting a GTK1 app that used the GtkTree widget over to GTK2, and the 
shiny new GtkTreeView widget.

I've got everything working apart from a right-click context/popup menu.

The existing code attaches a callback to the "event" signal of the tree item, 
and manually checks for button 3.

Is there an "approved" way to implement this in GTK 2?  Or, indeed, a way 
that works :-)  I was hoping for a special-purpose signal on the view that 
gives me a row back, but I can't see one.

I've been looking through the docs and the list archives and can't see an 
obvious way to do this.

Thanks in advance
Dave Malcolm