bmpYOff                                       (Assignable)

        Contains a numeric value that indicates the offset where the bitmap
        is displayed.  This instance variable represents the number of pixels
        in the y direction (vertically) from the top edge of the button where
        the bitmap will be displayed.  If this instance variable is not
        supplied, the bitmap will be placed at the top edge of the button.
        This instance variable only affects applications running in graphic
        mode and is ignored in text mode.