Tkinter rename, step 2: fix imports and add stub modules.
diff --git a/Lib/lib-tk/tkMessageBox.py b/Lib/lib-tk/tkMessageBox.py
new file mode 100644
index 0000000..cea676d
--- /dev/null
+++ b/Lib/lib-tk/tkMessageBox.py
@@ -0,0 +1,8 @@
+import sys
+from warnings import warnpy3k
+
+warnpy3k("the tkMessageBox module has been renamed "
+         "to 'tkinter.messagebox' in Python 3.0", stacklevel=2)
+
+import tkinter.messagebox
+sys.modules[__name__] = tkinter.messagebox