Your cycling through five iterations before returning to the mainloop. Does this make sense to you? You are changing the contents of the widget 5 times and then returning to the mainloop for it to process the results.

Unless in some part of those subroutines there is a call back to the mainloop, i'm not sure how you would even do this, then the mainloop, which processes all tk events, would not ever see the changes that are happening.

If I am entirely missing the point here I apologize. This is just what i see.

Dave