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  SBCHRBAR()                                             Scroll Bar Function
 Purpose..: Change the scroll bar fill character
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 Syntax...: sbChrBar( <aSBar>[, <cBar>] ) --> cCurBarChr

 Arguments: <aSBar>     = scroll bar structure returned via
                          a call to sbNew().

            [<cBar>]    = bar fill character to use. The default
                          is chr( 176 ) or "#".

 Returns..: <C> cCurBarChr is the previous bar fill character, if <cBar>
            is not passed. Otherwise it returns the current one.

 Source...: SCRLBAR.PRG
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 Example..: . The example creates a new horizontal
              scroll bar structure, changes the thumb character
              and the bar fill character.

                aHorizSB := sbNew( SB_HSCROLL )
                sbChrThumb( aHorizSB, "." )
                sbChrBar  ( aHorizSB, "#" )