A notebook widget for Tk similar to what is seen in the old python IDE
Defines a Notebook class to be used with Tkinter. A Notebook instance has the attributes change_tab, add_tab, destroy_tab, and focus_on.
change_tab: Internal Function, I don't suggest you call this directly.
add_tab: Creates a tab
destroy_tab: destroys the given tab
focus_on: Focuses on the given tab
The __init__ function creates three frames. One to hold the tabs together,
one to create the base to parent each tab's children, and one to hold the
base frame and the tab frame together.
Each tab is a Label with a default relief of "GROOVE". Each label uses
event bindings so that change_tab is called with the tab's ID Number as
an argument. Each tab relief, when selected is set by default to "RAISED"
For an exampe, view the source code, and run the module.