IMGUIOverlay is an implementation of Overlay that provides a IMGUIContainer.
Inherit IMGUIOverlay to author Overlay elements implemented using the legacy IMGUI controls.
| CreatePanelContent | CreatePanelContent is invoked by the OverlayCanvas when this Overlay is shown. | 
| OnGUI | Implement IMGUI controls and logic in this method. | 
| ussClassName | USS class name of elements of this type. | 
| collapsed | Defines whether the overlay is in collapsed form. | 
| containerWindow | EditorWindow the overlay is contained within. | 
| displayed | Shows or hides the overlay. | 
| displayName | Name of overlay used as title. | 
| floating | Returns true if overlay is floating, returns false if overlay is docked in a corner or in a toolbar. | 
| floatingPosition | Local position of closest overlay corner to closest dockposition when floating. | 
| id | Overlay unique ID. | 
| isInToolbar | Returns true if overlay is docked in a toolbar. | 
| layout | Describes the presentation mode for an Overlay. | 
| OnCreated | OnCreated is invoked when an Overlay is instantiated in an Overlay Canvas. | 
| OnWillBeDestroyed | Called when an Overlay is about to be destroyed. | 
| Undock | If this Overlay is currently in a toolbar, it will be removed and return to a floating state. | 
| collapsedChanged | Invoked when Overlay.collapsed value is changed. | 
| displayedChanged | This callback is invoked when the Overlay.displayed value has been changed. | 
| floatingChanged | Called when the value of floating has changed. | 
| floatingPositionChanged | This event is invoked when Overlay.floatingPosition is changed. | 
| layoutChanged | Subscribe to this event to be notified when the Overlay.Layout property is modified. |