[ruby-gnome2-devel-en] GTK3 TreeView set_select_function support?

[<Ra...@la...>]

The code ...

@class_tree.selection.set_select_function do |selection, class_tree_model, 
path, currently_selected|
  @controller.on_class_selected(selection, class_tree_model, path, 
currently_selected)
end

... produces this error ...

.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/gobject-introspection/loader.rb:551:in 
`invoke': TODO: <TreeSelectionFunc>(func) callback is not supported yet. 
(NotImplementedError)

I'm running off git master and am migrating a project from gtk2 to gtk3. 
Have I done something wrong or is Gtk3's  #set_select_function really not 
implemented yet?  If not, is there something I can do to help resolve 
this?  "gobject-introspection/loader.rb:551" didn't lead me to the code 
responsible for this and searching the code didn't provide enough of a 
clue.

Jon