partial         void CopyExtraPropertiesToClone(GridWidgetStateSet clone, bool includeLocalProperties);
 public GridWidgetStateSet Clone(bool includeLocalProperties)
 {
     var c = new GridWidgetStateSet
             {
                 HostId = HostId,
                 Positions = Positions,
             };
     CopyExtraPropertiesToClone(c, includeLocalProperties);
     return c;
 }