Index: Lib/lib-tk/Tix.py
===================================================================
--- Lib/lib-tk/Tix.py	(revision 73494)
+++ Lib/lib-tk/Tix.py	(working copy)
@@ -1563,7 +1563,7 @@
     # FIXME: It should inherit -superclass tixTree
     def __init__(self, master=None, cnf={}, **kw):
         TixWidget.__init__(self, master, 'tixCheckList',
-                           ['options'], cnf, kw)
+                           ['options', 'radio'], cnf, kw)
         self.subwidget_list['hlist'] = _dummyHList(self, 'hlist')
         self.subwidget_list['vsb'] = _dummyScrollbar(self, 'vsb')
         self.subwidget_list['hsb'] = _dummyScrollbar(self, 'hsb')