I'm having trouble figuring out how to set up a callback for an item in a Ctree, it seems to work totally differently from the Gtk::Tree class. Does anyone have a pointer or suggestion for how to find out? Groveling through the source would be a last resort I suppose (but since it's not in Ruby I'd hate to have to do that! <G>) Cullen J O'Neill -- cjon / engin.umich.edu