Arguments: scroll-bar-mixin
Returns the value of the increment property of its argument. This property is a numeric (fixnum) value relating to the range of the object. For instance, if the range is (0 100) and the increment is 1, then pressing an arrow key will advance the control's slider bar 1/100 of the way across the dialog in that arrow's direction.
increment is a property of the up-down-control, trackbar, horizontal-scroll-bar,
and vertical-scroll-bar classes.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
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Created 2000.10.5.