| Value | Member | Description |
| 0 | None | No change. |
| 1 | BringToFront | As a result of either calling the BringToFront method manually or from the user interface. |
| 2 | SendToBack | As a result of either calling the AnnAutomation.SendToBack method manually or from the user interface. |
| 3 | Deleted | As a result of either calling the DeleteSelectedObjects method manually or from the user interface. |
| 4 | Lock | As a result of either calling the Lock method manually or from the user interface. |
| 5 | Unlock | As a result of either calling the Unlock method manually or from the user interface. |
| 6 | Paste | Not used. |
| 7 | Flip | As a result of either calling the AnnAutomation.Flip method manually or from the user interface. |
| 8 | RealizeRedaction | As a result realizing a redaction object. |
| 9 | RestoreRedaction | As a result of restoring a redaction object. |
| 10 | ApplyEncryptor | Not used. |
| 11 | ApplyDecryptor | Not used. |
| 12 | Name | As a result of changing an AnnObjectsLabels property. |
| 13 | Hyperlink | As a result of changing an AnnObjectsHyperlink property. |
| 14 | Text | As a result of changing an AnnTextObject derived object. |
| 15 | Picture | As a result of changing the Picture property of an annotation object. |
| 16 | Pictures | Not used |
| 17 | Ruler | As a result of changing an AnnPolyRulerObject derived object. |
| 18 | Stroke | As a result of changing an AnnObjectsStroke property. |
| 19 | Fill | As a result of changing an AnnObjectsFill property. |
| 20 | Font | As a result of changing an AnnObjectsFont property. |
| 21 | Encrypt | Not used. |
| 22 | Polygon | As a result of changing a polygon object. |
| 23 | Curve | As a result of changing an AnnCurveObject. |
| 24 | Protractor | As a result of changing an AnnProtractorObject. |
| 25 | RubberStamp | As a result of changing an AnnRubberStampObject. |
| 26 | Point | As a result of changing an AnnPointObject. |
| 27 | Audio | Not used. |
| 28 | Thumbs | As a result of changing an AnnObjectsPoints. |
| 29 | Hilite | As a result of changing an AnnHiliteObject. |
| 30 | DesignerDraw | As a result of the user interface drawing a new object via the AnnDrawDesigner user interface. |
| 31 | DesignerEdit | As a result of the user interface editing an existing object via the AnnEditDesigner user interface. |
| 32 | ResetRotatePoints | As a result of resetting the rotate control points of an existing object via the AnnEditDesigner user interface. For more information, refer to Annotation Rotation Options. |
| 33 | Fixed | As a result of changing fixed state property of an object (FixedStateOperations). |
| 34 | Added | An object is added. |
| 35 | Modified | An object is modified. |
| 36 | Metadata | An object metadata is modified. |