Destroy and unlink deleted NoteBook panes. Fixes #516703.
2.2.2 candidate.
diff --git a/Lib/lib-tk/Tix.py b/Lib/lib-tk/Tix.py
index 79de234..18b8673 100755
--- a/Lib/lib-tk/Tix.py
+++ b/Lib/lib-tk/Tix.py
@@ -466,7 +466,6 @@
  
     def delete(self):
        self.tk.call(self.stylename, 'delete')
-       del(self)
  
     def __setitem__(self,key,value):
        self.tk.call(self.stylename, 'configure', '-%s'%key, value)
@@ -1093,6 +1092,8 @@
 
     def delete(self, name):
        self.tk.call(self._w, 'delete', name)
+       self.subwidget_list[name].destroy()
+       del self.subwidget_list[name]
 
     def page(self, name):
        return self.subwidget(name)