Scrollbar abstraction

Horisontal and vertical scrollbars - Tk/Motif style.

• Examples: A Scrollbar example.
• Interface description: Overview of functionality.

Scrollbar Reference:

• Interface index: complete list of functionality provided.
• Creator index: how to create a Scrollbar.
• Operator index: Operators on component.
• Resources: How to customise resources.
• See also: Abstractions related to Scrollbar.