public class TinLayerCreationParams : LayerCreationParams 

//Must be on the QueuedTask.Run()

string tinPath = @"d:\Data\Tin\TinDataset";
var tinURI = new Uri(tinPath);

var tinCP = new TinLayerCreationParams(tinURI);
tinCP.Name = "My TIN Layer";
tinCP.IsVisible = false;

//Create the layer to the TIN
var tinLayer = LayerFactory.Instance.CreateLayer<TinLayer>(tinCP, map);

//Must be on the QueuedTask.Run()

var tinCP_ds = new TinLayerCreationParams(tinDataset);
tinCP_ds.Name = "My TIN Layer";
tinCP_ds.IsVisible = false;

//Create the layer to the TIN

var tinLayer_ds = LayerFactory.Instance.CreateLayer<TinLayer>(tinCP_ds, map);

//Must be on the QueuedTask.Run()

var tinCP_renderers = new TinLayerCreationParams(tinDataset);
tinCP_renderers.Name = "My TIN layer";
tinCP_renderers.IsVisible = true;

// define the node renderer - use defaults
var node_rd = new TinNodeRendererDefinition();

// define the face/surface renderer
var face_rd = new TinFaceClassBreaksRendererDefinition();
face_rd.ClassificationMethod = ClassificationMethod.NaturalBreaks;
// accept default color ramp, breakCount

// set up the renderer dictionary
var rendererDict = new Dictionary<SurfaceRendererTarget, TinRendererDefinition>();
rendererDict.Add(SurfaceRendererTarget.Points, node_rd);
rendererDict.Add(SurfaceRendererTarget.Surface, face_rd);

// assign the dictionary to the creation params
tinCP_renderers.RendererDefinitions = rendererDict;

// create the layer
var tinLayer_rd = LayerFactory.Instance.CreateLayer<TinLayer>(tinCP_renderers, MapView.Active.Map);