Byzi - Tk busy command implementation
Found on GitHub at https://github.com/aryler/Byzi/ .
Version 0.2, Spring 2017.
The Byzi extension for Tk provides a simple means to block keyboard, button and pointer events from Tk widgets, while overriding the widget's cursor with a configurable busy cursor.
The Byzi extension is based on the Tk 8.6 busy command sources.