public sealed class StreamLayer : FeatureLayer, IDisplayTable, ITableDefinitionFilters, System.ComponentModel.INotifyPropertyChanged, System.IDisposable  

//Must be on the QueuedTask
var url = "https://geoeventsample1.esri.com:6443/arcgis/rest/services/AirportTraffics/StreamServer";
var createParam = new FeatureLayerCreationParams(new Uri(url))
{
  IsVisible = false //turned off by default
};
var streamLayer = LayerFactory.Instance.CreateLayer<StreamLayer>(createParam, map);

//or use "original" create layer (will be visible by default)
Uri uri = new Uri(url);
streamLayer = LayerFactory.Instance.CreateLayer(uri, map) as StreamLayer;
streamLayer.SetVisibility(false);//turn off

//Must be on the QueuedTask
var url = "https://geoeventsample1.esri.com:6443/arcgis/rest/services/AirportTraffics/StreamServer";
var lyrCreateParam = new FeatureLayerCreationParams(new Uri(url))
{
  IsVisible = true,
  DefinitionFilter = new CIMDefinitionFilter()
  {
    DefinitionExpression = "RWY = '29L'",
    Name = "Runway"
  }
};

var streamLayer = LayerFactory.Instance.CreateLayer<StreamLayer>(lyrCreateParam, map);

var url = @"https://geoeventsample1.esri.com:6443/arcgis/rest/services/AirportTraffics/StreamServer";
var uri = new Uri(url, UriKind.Absolute);
//Must be on QueuedTask!
var createParams = new FeatureLayerCreationParams(uri)
{
  IsVisible = false
};
var streamLayer = LayerFactory.Instance.CreateLayer<StreamLayer>(
                    createParams, map);
//Define the unique values by hand
var uvr = new CIMUniqueValueRenderer()
{
  Fields = new string[] { "ACTYPE" },
  UseDefaultSymbol = true,
  DefaultLabel = "Others",
  DefaultSymbol = SymbolFactory.Instance.ConstructPointSymbol(
              CIMColor.CreateRGBColor(185, 185, 185), 8, SimpleMarkerStyle.Hexagon).MakeSymbolReference()
};

var classes = new List<CIMUniqueValueClass>();
//add in classes - one for ACTYPE of 727, one for DC 9
classes.Add(
  new CIMUniqueValueClass() {
        Values = new CIMUniqueValue[] {
              new CIMUniqueValue() { FieldValues = new string[] { "B727" } } },
        Visible = true,
        Label = "Boeing 727",
        Symbol = SymbolFactory.Instance.ConstructPointSymbol(
              ColorFactory.Instance.RedRGB, 10, SimpleMarkerStyle.Hexagon).MakeSymbolReference()
});
classes.Add(
  new CIMUniqueValueClass()
  {
    Values = new CIMUniqueValue[] {
              new CIMUniqueValue() { FieldValues = new string[] { "DC9" } } },
    Visible = true,
    Label = "DC 9",
    Symbol = SymbolFactory.Instance.ConstructPointSymbol(
              ColorFactory.Instance.GreenRGB, 10, SimpleMarkerStyle.Hexagon).MakeSymbolReference()
  });
//add the classes to a group
var groups = new List<CIMUniqueValueGroup>()
{
  new CIMUniqueValueGroup() {
     Classes = classes.ToArray()
  }
};
//add the groups to the renderer
uvr.Groups = groups.ToArray();
//Apply the renderer (for current observations)
streamLayer.SetRenderer(uvr);
streamLayer.SetVisibility(true);//turn on the layer

//The layer must be track aware and spatial
if (streamLayer.TrackType != TrackType.Spatial)
  return;
//Must be on QueuedTask!
//Define unique value classes same as we do for current observations
//or use "CreateRenderer(...)" to assign them automatically
CIMUniqueValueClass uvcB727Prev = new CIMUniqueValueClass()
{
  Values = new CIMUniqueValue[] { new CIMUniqueValue() {
    FieldValues = new string[] { "B727" } } },
  Visible = true,
  Label = "Boeing 727",
  Symbol = SymbolFactory.Instance.ConstructPointSymbol(
    CIMColor.CreateRGBColor(255, 0, 0), 4, SimpleMarkerStyle.Hexagon)
    .MakeSymbolReference()
};

CIMUniqueValueClass uvcD9Prev = new CIMUniqueValueClass()
{
  Values = new CIMUniqueValue[] { new CIMUniqueValue() {
    FieldValues = new string[] { "DC9" } } },
  Visible = true,
  Label = "DC 9",
  Symbol = SymbolFactory.Instance.ConstructPointSymbol(
    CIMColor.CreateRGBColor(0, 255, 0), 4, SimpleMarkerStyle.Hexagon)
    .MakeSymbolReference()
};

CIMUniqueValueGroup uvGrpPrev = new CIMUniqueValueGroup()
{
  Classes = new CIMUniqueValueClass[] { uvcB727Prev, uvcD9Prev }
};

var UVrndrPrev = new CIMUniqueValueRenderer()
{
  Fields = new string[] { "ACTYPE" },
  Groups = new CIMUniqueValueGroup[] { uvGrpPrev },
  UseDefaultSymbol = true,
  DefaultLabel = "Others",
  DefaultSymbol = SymbolFactory.Instance.ConstructPointSymbol(
    CIMColor.CreateRGBColor(185, 185, 185), 4, SimpleMarkerStyle.Hexagon)
    .MakeSymbolReference()
};

//The layer must be track aware and spatial
if (streamLayer.TrackType != TrackType.Spatial)
  return;
//Must be on QueuedTask!
//Note: only a simple renderer with solid line symbol is supported for track 
//line renderer
var trackRenderer = new SimpleRendererDefinition()
{
  SymbolTemplate = SymbolFactory.Instance.ConstructLineSymbol(
      ColorFactory.Instance.BlueRGB, 2, SimpleLineStyle.Solid)
        .MakeSymbolReference()
};
streamLayer.SetRenderer(
     streamLayer.CreateRenderer(trackRenderer), 
       FeatureRendererTarget.TrackLines);

//The layer must be track aware and spatial for these settings
//to have an effect
if (streamLayer.TrackType != TrackType.Spatial)
  return;
//Must be on QueuedTask
//Note: Setting PreviousObservationsCount larger than the 
//"SetExpirationMaxCount()" has no effect
streamLayer.SetPreviousObservationsCount(6);
if (!streamLayer.AreTrackLinesVisible)
  streamLayer.SetTrackLinesVisibility(true);
if (!streamLayer.ArePreviousObservationsVisible)
  streamLayer.SetPreviousObservationsVisibility(true);