First go at support of focusable widgets inside the palette.

Not enabled yet because focus confuses our deactivation logic
but it seem to work otherwise.

sugar/_sugaruiext.override

@@ -18,6 +18,7 @@ modulename _sugarext
 import gobject.GObject as PyGObject_Type
 import gtk.Entry as PyGtkEntry_Type
 import gtk.Menu as PyGtkMenu_Type
+import gtk.Container as PyGtkContainer_Type
 import gtk.gdk.Window as PyGdkWindow_Type
 %%
 ignore-glob