--- a/appobject.py	Wed Feb 18 00:03:27 2009 +0100
+++ b/appobject.py	Wed Feb 18 00:12:34 2009 +0100
@@ -104,7 +104,7 @@
     def __selectors__(cls):
         selector = cls.__select__
         if isinstance(selector, AndSelector):
-            return selector.selectors
+            return tuple(selector.selectors)
         if not isinstance(selector, tuple):
             selector = (selector,)
         return selector