code: private void hideNativeScrollbars() {
  
          m_nativeScrollbarWidth = AbstractNativeScrollbar.getNativeScrollbarWidth();
          getScrollableElement().getStyle().setMarginRight(-(m_nativeScrollbarWidth + 10), Unit.PX);
      }
docs: Hide the native scrollbars. We call this after attaching to ensure that we
  inherit the direction (rtl or ltr).