SimpleList is a simple interface to the powerful but complex Gtk2::TreeView 
and Gtk2::ListStore combination, implementing using tied arrays to make thing 
simple and easy.

Gtk2 has a powerful, but complex MVC (Model, View, Controller) system 
used to implement list and tree widgets. Gtk2::Ex::Simple::List automates 
the complex setup work and allows you to treat the list model as a more 
natural list of lists structure.
