A Tabbed Group (a TabbedGroup object) represents layout panels as a tab container:
In XAML, you can add panels to a tabbed group by defining LayoutPanel elements between the start and end TabbedGroup tags. In code, you can add items to a TabbedGroup via its Items property.
To select a specific tab to make it visible to an end-user, use the LayoutGroup.SelectedTabIndex property.
To combine panels into a Tabbed Group in code, use the DockController.Dock method of the DockLayoutManager.DockController object. The method’s DockType parameter must be set to DockType.Fill to create a Tabbed Group.
Dock operations on panels are prohibited if the BaseLayoutItem.AllowDock option is disabled.