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The Scroller control contains a pair of scroll bars and a viewport. A viewport displays a rectangular 
subset of the area of a component, rather than displaying the entire component. You can use the 
Scroller control to make any container that implements the IViewport interface, such as Group, scrollable.

The scroll bars control the viewport's vertical and horizontal scroll position. They reflect the 
viewport's actual size and content size. Scroll bars are displayed according to the Scroller's vertical 
and horizontal scroll policy properties. By default, the policy is set to "auto". This value indicates 
that scroll bars are displayed when the content within a viewport is larger than the actual size of the 
viewport.
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