--- a/web/views/treeview.py	Wed Jun 09 09:42:52 2010 +0200
+++ b/web/views/treeview.py	Wed Jun 09 09:58:23 2010 +0200
@@ -21,6 +21,7 @@
 __docformat__ = "restructuredtext en"
 
 from warnings import warn
+from itertools import chain
 
 from logilab.mtconverter import xml_escape
 from logilab.common.decorators import cached