Language Reference Guide : System Classes : ScrollBarField Class : StepSize Attribute
 
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StepSize Attribute
Data Type: integer
4GL Access: RW
The StepSize attribute specifies the size of the change in value for a click on the step marker.
The step markers are above and below the elevator, often at the top and bottom of the scroll bar, usually indicated with up and down arrows. For example, if you set StepSize to 10, then clicking the step marker moves the elevator box 10 units in the appropriate direction.
Default: 1