capXOff                                       (Assignable)

        Contains a numeric value that indicates the offset where the caption
        is displayed.  This instance variable represents the number of pixels
        in the x direction (horizontally) from the left edge of the button
        where the caption will be displayed.  If this instance variable is
        not supplied, the caption will be centered horizontally.  This
        instance variable only affects applications running in graphic mode
        and is ignored in text mode.