Tcl/Tk clipboard under Windows

[Michael S. Schliephake]

Has anyone remarked the following problem and possibly a solution?

(Win-NT 4, W98 - Python 1.5.2, Tk 8.05)
If you copy some text from a Tkinter-prog to the clipboard and the
program is finished immediately, one cannot paste the clipboard content
into another programm. If you paste before finishing the Python-program,
the clipboard content is how intended and remains there.

The problem seems to be in the Tcl/Tk implementation because Tcl/Tk
standalone behaves in the same way. Has anyone enough knowledge of the
Tk-implementation to help with a correction?

Thanks,
Michael Schliephake.