Hints for Layer changes.
| Constant | Value | Description | 
| esriLayerEventHintProperties | 0 | Layer Properties changed. Event Parameters: None | 
| esriLayerEventHintVisibility | 1 | Layer Visibility changed. Event Parameters: None | 
| esriLayerEventHintLayerAddedToGroup | 2 | Layer added to Group Layer. Event Parameters: ILayer* Layer | 
| esriLayerEventHintLayerRemovedFromGroup | 3 | Layer removed from Group Layer. Event Parameters: ILayer* Layer | 
| esriLayerEventHintLayerMovedWithinGroup | 4 | Layer moved within Group Layer. Event Parameters: ILayer* Layer, long position | 
 
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server. 
.NET Related Topics
Creating and working with basemap layers