rwt.runtime.MobileWebkitSupport._adaptScrollYOffset = function( scrollY ) {
  if( this._isGridRowContainer( this._touchSession.widgetTarget ) ) {
      var grid = this._touchSession.widgetTarget.getParent();
      var offsetY = (scrollY - this._touchSession.initScrollY);
      var item = grid.getRootItem().findItemByOffset( scrollY );
      return item ? item.getFlatIndex() : ((offsetY > 0) ? grid.getRootItem().getLastChild() : 0);
    }
    return scrollY ;
};