Language Reference Guide : 4. System Classes : ScrollBarField Class : PageSize Attribute
 
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PageSize Attribute
Data Type: integer
4GL Access: RW
The PageSize attribute specifies the size of the change in value for a page step.
A page step occurs when the user clicks the scroll bar above or below the elevator box. For example, if you set PageSize to five, then a click above or below the elevator box moves the elevator five units in the appropriate direction.