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  SBPLANE()                                              Scroll Bar Function
 Purpose..: Return the X or Y axis of the scroll bar
-------------------------------------------------------------------------------
 Syntax...: sbPlane( <aSBar> ) --> nXorYAxis

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

 Returns..: <N> nXorYAxis is the Y axis for a vertical scroll bar OR
            the X axis for a horizontal one. In other words, it is the
            plane on which the scroll bar lies.

 Source...: SCRLBAR.PRG
-------------------------------------------------------------------------------
 Example..: . The example prints out the axis on which
              the scroll bar lies.

                aVertSB := sbNew( SB_VSCROLL )
                sbChrThumb( aVertSB, "." )
                sbChrBar  ( aVertSB, "#" )
                sbChrDec  ( aVertSB, "." )
                sbChrInc  ( aVertSB, "." )
                sbClrSpec ( aVertSB, "W+/B, B/*W, W+/B" )
                sbSetRange( aVertSB, 1, len( aArray ) - nScrLength + 1 )
                ...
                ? sbPlane( aVertSB )
                ...