private void AttachLayerEventHandler(Layer layer)
{
Debug.Assert(layer != null);
if (layer is ILegendSupport)
(layer as ILegendSupport).LegendChanged += new EventHandler<EventArgs>(Layer_LegendChanged);
if (layer is ISublayerVisibilitySupport)
(layer as ISublayerVisibilitySupport).VisibilityChanged += new EventHandler<EventArgs>(Layer_VisibilityChanged);
layer.PropertyChanged += new PropertyChangedEventHandler(Layer_PropertyChanged);
layer.Initialized += new EventHandler<EventArgs>(Layer_Initialized);
}