SnappedBackButtonStyle is used to style a Button for use in the title area of a snapped page. Margins appropriate for the ...

        SnappedBackButtonStyle is used to style a Button for use in the title area of a snapped page.  Margins appropriate
        for the conventional page layout are included as part of the style.
        
        The obvious duplication here is necessary as the glyphs used in snapped are not merely smaller versions of the same
        glyph but are actually distinct.