public class TinLayerCreationParams : LayerCreationParams 

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

  var tinCP = new TinLayerCreationParams(tinURI);
  tinCP.Name = "My TIN Layer";
  tinCP.IsVisible = false;
  // Note: Needs QueuedTask to run
  {
    //Create the layer to the TIN
    tinLayer = LayerFactory.Instance.CreateLayer<TinLayer>(tinCP, map);
  }
}

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

  //Create the layer to the TIN
  // Note: Needs QueuedTask to run
  {
    var tinLayer_ds = LayerFactory.Instance.CreateLayer<TinLayer>(tinCP_ds, map);
  }
}

{
  var tinCP_renderers = new TinLayerCreationParams(tinDataset)
  {
    Name = "My TIN layer",
    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>
{
  { SurfaceRendererTarget.Points, node_rd },
  { SurfaceRendererTarget.Surface, face_rd }
};

  // assign the dictionary to the creation params
  tinCP_renderers.RendererDefinitions = rendererDict;
  // Note: Needs QueuedTask to run
  {
    // create the layer
    var tinLayer_rd = LayerFactory.Instance.CreateLayer<TinLayer>(tinCP_renderers, MapView.Active.Map);
  }
}