Attribute used to register a class as an overlay.
Overlay must derive from the Overlay class.
| defaultDisplay | Set this value to true to ensure that the target Overlay will be shown when a new instance of the EditorWindow type is instantiated. |
| defaultDockIndex | Set the defaultDockIndex to define where in a DockZone an Overlay is placed. |
| defaultDockPosition | Set defaultDockPosition to define the default alignment for a newly instantiated Overlay. |
| defaultDockZone | Use defaultDockZone to set the default location for an Overlay when it is made visible for the first time in a new EditorWindow. |
| defaultLayout | Set defaultLayout to define the Layout for an Overlay when it is created for the first time. |
| displayName | Defines what the display name of the overlay will be. |
| editorWindowType | Defines which EditorWindow type the overlay will be used in. |
| id | Defines the unique identifier used to identify the overlay. |
| ussName | Name of the overlay's root visual element. |
| OverlayAttribute | Attribute used to register a class as an Overlay. |