The Tix (Tk Interface Extension) module provides an additional
rich set of widgets. Although the standard Tk library has many
useful widgets, they are far from complete. The Tix library
provides most of the commonly needed widgets that are missing
from standard Tk: HList, ComboBox, Control (a.k.a. SpinBox) and
an assortment of scrollable widgets. Tix also includes many more
widgets that are generally useful in a wide range of
applications: NoteBook, FileEntry, PanedWindow, etc; there are
more than 40 of them. With all these new widgets, you can
introduce new interaction techniques into applications, creating
more useful and more intuitive user interfaces. You can design
your application by choosing the most appropriate widgets to
match the special needs of your application and users. Toplevel
widget of Tix which represents mostly the main window of an
application. It has an associated Tcl interpreter. Classes in
the Tix module subclasses the classes in the Tkinter module. The
former imports the latter, so to