Represents the method that handles the ActiveGraphicsLayerChanged event.
[Visual Basic .NET] Public Delegate Sub ActiveGraphicsLayerChangedEventHandler ( _ ByVal oldGraphicsLayer As IGraphicsLayer, _ ByVal newGraphicsLayer As IGraphicsLayer _ )
[C#] public delegate void ActiveGraphicsLayerChangedEventHandler ( IGraphicsLayer oldGraphicsLayer, IGraphicsLayer newGraphicsLayer );