A program that demonstrates how to use tkinters treeview widget.
This program is just a demo and has no funtion other then showing how the extended tkinter treeview class works.
The code is in develoment and will be until this message is no longer here.
If you download this version and have already run a previous version of this demo then delete the two json files 'app.json' and 'treeview.json'. If you don't delete these files the new version may crash or not even work.