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  SBDISPLAY()                                            Scroll Bar Function
 Purpose..: Display the scroll bar on the screen
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 Syntax...: sbDisplay( <aSBar>, <nR>, <nC>, <nLen> ) --> NIL

 Arguments: <aSBar>     = scroll bar structure returned via
                          a call to sbNew(). It is the scroll bar
                          to display on the screen.

            <nR>        = row where to display scroll bar.

            <nC>        = column where to display scroll bar.

            <nLen>      = scroll bar length or width depending upon
                          whether the scroll bar is to be vertical or
                          horizontal.

 Returns..: NIL

 Source...: SCRLBAR.PRG
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 Example..: . The example creates a new horizontal
              scroll bar structure, sets the range, draws it and
              then sets its initial position.

              aVertSB := wNew( SB_VSCROLL )
              sbSetRange( aVertSB, 1, lastrec() )
              sbDisplay ( aVertSB, 1, 78, 23 )
              sbSetPos  ( aVertSB, 1 )