Fabrice, this script isn't intended to be a final product. It is
a quick example of how to create a GUI design tool. I played with
it for a while and fixed a bug or two but ultimately took it for
what it is, an example. I have another proto-type GUI editor that
Bo wrote for me and ultimately (Hopefully within the next couple
of months) I will have a decent stable GUI editor released. If you
want to play with one of your own, this is a good place to start.