Widgets
-------
The general steps to using a widget in PyGTK are:

    * invoke gtk.* - one of various functions to create a new widget. 
These are all detailed in this section.
    * Connect all signals and events we wish to use to the appropriate 
handlers.
    * Set the attributes of the widget.
    * Pack the widget into a container using the appropriate call such 
as gtk.Container.add() or gtk.Box.pack_start() .
    * gtk.Widget.show() the widget.

show() lets GTK know that we are done setting the attributes of the 
widget, and it is ready to be displayed.