A button box should be used to provide a consistent layout of buttons
throughout your application. The layout/spacing can be altered by the
programmer, or if desired, by the user to alter the 'feel' of a program to
a small degree.
A VButtonBox is created with vButtonBoxNew. Buttons are packed into a
button box the same way widgets are added to any other container, using
containerAdd. You can also use boxPackStart or boxPackEnd, but for
button boxes both these functions work just like containerAdd, ie., they
pack the button in a way that depends on the current layout style and on
whether the button has had buttonBoxSetChildSecondary called on it.
The spacing between buttons can be set with boxSetSpacing. The
arrangement and layout of the buttons can be changed with