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  SBCHRTHUMB()                                           Scroll Bar Function
 Purpose..: Change the scroll bar thumb character
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 Syntax...: sbChrThumb( <aSBar>[, <cThumb>] ) --> cThumbChr

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

            [<cThumb>]  = thumb character to use. The default
                          is chr( 178 ) or "#".

 Returns..: <C> cThumbChr is the previous thumb character, if <cThumb>
            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 and changes the thumb character.

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