diff -r d4c2fb633062 -r 476a75ede2cc web/formfields.py
--- a/web/formfields.py	Tue Jun 23 13:34:28 2009 +0200
+++ b/web/formfields.py	Tue Jun 23 13:46:18 2009 +0200
@@ -406,6 +406,9 @@
             name=name, widget=HiddenInput, eidparam=True)
         self.visible_field = visible_field
 
+    def format_single_value(self, req, value):
+        return self.visible_field.format_single_value(req, value)
+
 
 class RelationField(Field):
     def __init__(self, **kwargs):