after getting the entry widget events to work as i wanted, i started looking at some other things to do, and my first attempt failed with this : Couldn't match expected type `Gtk.Signal (Gtk.Signal self0 (Gtk.EventM Gtk.EExpose Bool)) (t0 -> IO ())' with actual type `GtkGL.GLDrawingArea' In the second argument of `Gtk.on', namely `glCanvas' In the expression: Gtk.on Gtk.exposeEvent glCanvas In a stmt of a 'do' block: Gtk.on Gtk.exposeEvent glCanvas $ \ _ -> putStrLn "foo" Gtk.on Gtk.exposeEvent glCanvas $ putStrLn "foo" glCanvas is glCanvas <- GtkGL.glDrawingAreaNew glconfig I looked up the type of Gtk.on and exposeEvent : exposeEvent :: WidgetClass self => Signal self (EventM EExpose Bool) on :: object -> Signal object callback -> callback -> IO (ConnectId object) There are numerous problems starting with the type of 'callback' that I can't seem to trace in the documentation. And I can't figure out why callback is repeated... unfortunately it's not obvious what's going on. The type of the entry widget callback is much simpler, and quite a bit different, so I it's of little help. I'm having a hard time finding appropriate examples because everything seems to use the deprecated convention of on{eventType}, e.g. onExposeEvent or onButtonPress. I was hoping someone could teach me to fish and parse out the type for me and provide a simple example. Just pointing me to up-to-date examples would almost certainly be good enough, but I really need to understand the convention here, since I suspect as I try to attach events to other widget types I will see these sorts of problems again. Thanks, Brian