Scroll
bars appear automatically in any window that isn't big enough to
show all of it's contents.
ScrollBar lets you set
the look and feel of a window's scroll bars.
You can choose between
two styles: Double or Single. The Double one has it benefits when
you are working with big windows, as it has up and down arrows both
on the top and the bottom of the scroll bar.

The default style is the Double one.
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