private static void DataChangedCallback(AbstractFlexChart <T> i, DPChangedEventArgs <T> e)
 {
     i.FilteredData = i.DataFilter.Filter(i.DataSorter.Sort(e.NewValue));
     i.OnDataChanged(e);
 }
 private static void DataFilteredCallback(AbstractFlexChart <T> i, DPChangedEventArgs <T> e)
 {
     i.OnDataFiltered(e);
 }
 private static void DataSorterChanged(AbstractFlexChart <T> i, DPChangedEventArgs <DataSorter <T> > e)
 {
     i.FilteredData = i.DataFilter.Filter(i.DataSorter.Sort(i.Data));
 }