The C1FlexGrid can group data hierarchically and display it with a collapsible tree similar to the one in the Microsoft TreeView control. The GridTree object is used to specify the position and appearance of the outline tree.
For details on create outlines, see the C1.Win.C1FlexGrid.C1FlexGridBase.Subtotal(C1.Win.C1FlexGrid.AggregateEnum,System.Int32,System.Int32,System.Int32,System.Int32,System.String,C1.Win.C1FlexGrid.AggregateFlags,C1.Win.C1FlexGrid.RowColFlags) method and the Row.IsNode property.