public void SetGraphic( 
   CIMGraphic cimGraphic
)

{
  //Note: Must be on QueuedTask.Run
  //Create rectangle text with background and border symbology.  
  //Build 2D polygon geometry
  List<Coordinate2D> plyCoords = new List<Coordinate2D>();
  plyCoords.Add(new Coordinate2D(3.5, 7));
  plyCoords.Add(new Coordinate2D(4.5, 7));
  plyCoords.Add(new Coordinate2D(4.5, 6.7));
  plyCoords.Add(new Coordinate2D(5.5, 6.7));
  plyCoords.Add(new Coordinate2D(5.5, 6.1));
  plyCoords.Add(new Coordinate2D(3.5, 6.1));
  Polygon poly = PolygonBuilderEx.CreatePolygon(plyCoords);

  //Set symbology, create and add element to layout
  //Also notice how formatting tags are using within the text string.
  CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(
                    ColorFactory.Instance.GreyRGB, 10, "Arial", "Regular");
  string text = "Some Text String that is really long and is " +
                "<BOL>forced to wrap to other lines</BOL> so that " +
                "we can see the effects." as String;

  GraphicElement polyTxtElm = ElementFactory.Instance.CreateTextGraphicElement(
    layout, TextType.RectangleParagraph, poly, sym, text, "Polygon Paragraph");

  //(Optionally) Modify paragraph border 
  CIMGraphic polyTxtGra = polyTxtElm.GetGraphic();
  CIMParagraphTextGraphic cimPolyTxtGra = polyTxtGra as CIMParagraphTextGraphic;
  cimPolyTxtGra.Frame.BorderSymbol = new CIMSymbolReference();
  cimPolyTxtGra.Frame.BorderSymbol.Symbol =
               SymbolFactory.Instance.ConstructLineSymbol(
                          ColorFactory.Instance.GreyRGB, 1.0, SimpleLineStyle.Solid);
  polyTxtElm.SetGraphic(polyTxtGra);
}

{
  //Create a picture element and also set background and border symbology.

  //Note: Must be on QueuedTask.Run

  //Build 2D envelope geometry
  Coordinate2D pic_ll = new Coordinate2D(6, 1);
  Coordinate2D pic_ur = new Coordinate2D(8, 2);
  Envelope env = EnvelopeBuilderEx.CreateEnvelope(pic_ll, pic_ur);

  //Create and add element to layout
  string picPath = @"C:\Temp\WhitePass.jpg";

  GraphicElement picElm = ElementFactory.Instance.CreatePictureGraphicElement(
                                       layout, env, picPath, "New Picture");

  //(Optionally) Modify the border and shadow 
  CIMGraphic picGra = picElm.GetGraphic();
  CIMPictureGraphic cimPicGra = picGra as CIMPictureGraphic;
  cimPicGra.Frame.BorderSymbol = new CIMSymbolReference();
  cimPicGra.Frame.BorderSymbol.Symbol =
        SymbolFactory.Instance.ConstructLineSymbol(
               ColorFactory.Instance.BlueRGB, 2.0, SimpleLineStyle.Solid);

  cimPicGra.Frame.ShadowSymbol = new CIMSymbolReference();
  cimPicGra.Frame.ShadowSymbol.Symbol =
              SymbolFactory.Instance.ConstructPolygonSymbol(
                    ColorFactory.Instance.BlackRGB, SimpleFillStyle.Solid);

  //Update the element
  picElm.SetGraphic(picGra);
}

{
  //Update an element's transparency using the CIM.

  //Note: Must be on QueuedTask.Run

  // Reference a element by name
  GraphicElement graphicElement = layout.FindElement("MyElement") as GraphicElement;
  if (graphicElement != null)
  {
    // Modify the Transparency property that exists only in the CIMGraphic class.
    CIMGraphic CIMGraphic = graphicElement.GetGraphic() as CIMGraphic;
    CIMGraphic.Transparency = 50; // mark it 50% transparent
    graphicElement.SetGraphic(CIMGraphic);
  }
}

{
  // Note: must be called on the QueuedTask
  {
    //within a queued Task
    //get the first line element in the layer
    var ge = graphicsLayer.FindElement("Line 10") as GraphicElement;
    var graphic = ge.GetGraphic();
    if (graphic is CIMLineGraphic lineGraphic)
    {
      //change its symbol
      lineGraphic.Symbol =
       SymbolFactory.Instance.ConstructLineSymbol(
         SymbolFactory.Instance.ConstructStroke(
     ColorFactory.Instance.BlueRGB, 2, SimpleLineStyle.DashDot)).MakeSymbolReference();
      //apply the change
      ge.SetGraphic(lineGraphic);
    }
  }
}