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     Scrollbar (<nStart>, <nEnd>, <nOffset>, [<bSBlock>]
        [,<nOrient>]) --> oScrollBar

 Arguments

        <nStart> is a numeric value that indicates the screen position
        where the scroll bar begins.  <nStart> refers to the topmost row of a
        vertically oriented scroll bar, or the leftmost column of a
        horizontally oriented scroll bar.

        <nEnd> is a numeric value that indicates the screen position
        where the scroll bar ends.  <nEnd> refers to the bottommost row of a
        vertically oriented scroll bar, or the rightmost column of a
        horizontally oriented scroll bar.

        <nOffset> is a numeric value that indicates the screen column of
        a vertically oriented scroll bar or the screen row of a horizontally
        oriented scroll bar.

        <bSBlock> is an optional code block that, when present, is
        evaluated immediately before and after the ScrollBar object's state
        changes.

        <nOrient> is an optional numeric value that indicates whether the
        scroll bar is vertically or horizontally oriented.  The default is a
        vertically oriented scroll bar.

 Returns

     Returns a ScrollBar object when all of the required arguments are
     present; otherwise, Scrollbar() returns NIL.