Bug in Tkinter?

[Fredrik Lundh]

<tre17 at student.canterbury.ac.nz> wrote:
> Have a look at the following code.  It should produce a window
> containing two radio buttons, one of which is active when the program
> starts.  But it does not!  Now remove the comments, so that there is a 
> permanent reference to StringVar instance, and now it works?

feature, not bug.  it's related to:
http://www.python.org/doc/FAQ.html#4.69

</F>