System.Object
   System.Collections.ObjectModel.Collection<T>
      System.Collections.ObjectModel.ObservableCollection<T>
         C1.WPF.DataGrid.Summaries.DataGridAggregatesCollection
   System.Windows.Threading.DispatcherObject
      System.Windows.DependencyObject
         C1.WPF.DataGrid.DataGridRow
            C1.WPF.DataGrid.DataGridGroupRow
               C1.WPF.DataGrid.Summaries.DataGridGroupWithSummaryRow
            C1.WPF.DataGrid.Summaries.DataGridSummaryRow
         C1.WPF.DataGrid.Summaries.C1GroupingWithSummariesBehavior
         C1.WPF.DataGrid.Summaries.DataGridAggregate
            C1.WPF.DataGrid.Summaries.DataGridAggregateCount
            C1.WPF.DataGrid.Summaries.DataGridAggregateDistinct
            C1.WPF.DataGrid.Summaries.DataGridAggregateWithFormat
               C1.WPF.DataGrid.Summaries.DataGridAggregateAvg
               C1.WPF.DataGrid.Summaries.DataGridAggregateMax
               C1.WPF.DataGrid.Summaries.DataGridAggregateMin
               C1.WPF.DataGrid.Summaries.DataGridAggregateSum
         System.Windows.Media.Visual
            System.Windows.UIElement
               System.Windows.FrameworkElement
                  System.Windows.Controls.Control
                     C1.WPF.DataGrid.DataGridRowPresenter
                        C1.WPF.DataGrid.DataGridSelectableRowPresenter
                           C1.WPF.DataGrid.DataGridGroupRowPresenter
                              C1.WPF.DataGrid.Summaries.DataGridGroupWithSummaryRowPresenter

Reference

C1.WPF.DataGrid.Summaries.4 Assembly