Static Bitmap really IS static ... or ... how do I do this?

I am trying to display a small desktop window which will inform my user of
the contents of a registry entry, and allow him to change that registry. The
registry stuff works correctly and is replaced in the enclosed snippit with
a global variable called "Test".
  When the user changes the variable (as shown by the Title Bar) the graphic
also should change, but does not, or changes to the wrong size. What should
I be doing differently?

peppermill.jpg

montegobay.jpg

···

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Vernon

The enclosures are a working python program and two jpeg images for it to
display.