+ a facade but not if the button widget exists.
+
+ We have to translate the event's data by hand to be relative to the
+ parent window, because the normal GObject signal propagation mechanism
+ won't do it for us. (This might be a hint that we're doing this
+ wrong.) */
+ gint x, y;
+
+ gdk_window_get_position (event->window, &x, &y);
+ event->x += x;
+ event->y += y;