A class that represents the different types of a TitleBar.
The supported types of a TitleBar include Default, Segmented, and FreeForm.
The Default type supports title text, as well as the acceptAction and dismissAction elements.
The Segmented type supports options, as well as the selectedIndex and selectedOption elements.
The FreeForm type supports an indicator used to toggle between expanded and collapsed states. In addition, FreeForm supports an indicator toggle area, a content area where you can place controls, and an expandable area where you can place controls.
All types support the appearance and scrollBehavior properties.