Undo System Notifications

#sceneUndo: string 

Sent after a scene undo is performed. callbacks.notificationParam() returns the name of the undo entry in 3ds Max 8 and higher.

#sceneRedo: string 

Sent after a scene redo is performed. callbacks.notificationParam() returns the name of the undo entry 3ds Max 8 and higher.

EXAMPLE:

``` callbacks.removeScripts id:#test callbacks.addScript #sceneRedo "format "Redo: %\n" (callbacks.notificationParam())" id:#test callbacks.addScript #sceneUndo "format "Undo: %\n" (callbacks.notificationParam())" id:#test

```

#preSceneRedo: string 

Sent before a scene redo is performed. callbacks.notificationParam() returns the redo string.

#preSceneUndo: string 

Sent after a scene undo is performed. callbacks.notificationParam() returns the undo string.

#postRestoreObjsDeleted: unefined 

Sent when the undo system is flushed, and at least one RestoreObj was present in the undo system.