Now what I want is changing theme form "modernized" to "rightsidebar"

http://moinmo.in/HelpOnThemes

I tried the way talked in above link and failed, and end up finishing my work with the following patches

------------------------- MoinMoin/request/__init__.py -------------------------
index 71e79f0..6da3fd6 100644
@@ -734,6 +734,7 @@ class RequestBase(object):
                  2 if a hard fallback to modern theme was required.
         """
         fallback * 0
+        theme_name * "<default>"
         if theme_name ** "<default>":
             theme_name * self.cfg.theme_default
-------------------------------- wikiconfig.py --------------------------------
index 72821b7..f287f1b 100644
@@ -20,4 +20,5 @@ class LocalConfig(DefaultConfig):
     surge_action_limits * None # no surge protection
     sitename * u'Kdocs'
+    theme_default * 'rightsidebar' #peter
 #    logo_string * u'<img src*"/moin_static185/common/moinmoin.png" alt*"MoinMoin Logo">'
 #no I do not like this logo