'Synchronize changes with other views (callback).'

def _changed(self, widg=None):

    if (not self.initial):
        try:
            obj = self.get_object()
        except (BaseFrameworkException, ValueError):
            self.set_bg_color(gtk.gdk.color_parse('#FFCACA'))
            self.parentView.disable_attached_widgets()
        else:
            self.reset_bg_color()
            self.parentView.set_object(obj)
            self.parentView.synchronize(self.id)
