pygtk gtk.Builder.connect_signals onto multiple objects?

I am updating some code from using libglade to GtkBuilder, which is supposed to be the way of the future.

With gtk.glade, you could call glade_xml.signal_autoconnect(...) repeatedly to connect signals onto objects of different classes corresponding to different windows in the program. However Builder.connect_signals seems to work only once, and (therefore) to give warnings about any handlers that aren't defined in the first class that's passed in.

I realize I can connect them manually but this seems a bit laborious. (Or for that matter I could use some getattr hackery to let it connect them through a proxy to all the objects...)

Is it a bug there's no function to hook up handlers across multiple objects? Or am I missing something?

Someone else has a similar problem http://www.gtkforums.com/about1514.html which I assume means this can't be done.

Here's what I currently have. Feel free to use it, or to suggest something better:

class HandlerFinder(object):
    """Searches for handler implementations across multiple objects.
    """
    # See <http://stackoverflow.com/questions/4637792> for why this is
    # necessary.

    def __init__(self, backing_objects):
        self.backing_objects = backing_objects

    def __getattr__(self, name):
        for o in self.backing_objects:
            if hasattr(o, name):
                return getattr(o, name)
        else:
            raise AttributeError("%r not found on any of %r"
                % (name, self.backing_objects))