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 Scrolbar.prg
 Scroll bar functions
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     ScrollBarNew( <nTopRow>, <nTopColumn>, <nBottomRow>,
        <cColorString>, <nInitPosition> ) --> aScrollBar

     Create a new scroll bar array with the specified coordinates.

     ScrollBarDisplay( <aScrollBar> ) --> aScrollBar

     Display a scroll bar array to the screen.

     ScrollBarUpdate( <aScrollBar>, <nCurrent>, <nTotal>,
        <lForceUpdate> ) --> aScrollBar

     Update scroll bar array with new tab position and redisplay tab.