Method XbpScrollBar():setScrollBoxSize() Foundation
Sets or returns the size of scroll box.
:setScrollBoxSize( [<nUnits>] ) --> nOldUnits
This method returns a numeric value indicating the size of the scroll box before the method was called.
The method :setScrollBoxSize() allows the size of the scroll box to be changed after the method :create() has been called. The size is stored in the :scrollBoxSize instance variable.
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