Draw features in ArcMap using ArcGIS Addin tool (Arcobject's IRubberband Interface)

ArcmapCreateFeature

protected override void OnMouseDown(ESRI.ArcGIS.Desktop.AddIns.Tool.MouseEventArgs arg)
{
	//create geometery
	if (ArcMap.Document != null)
	{
		IScreenDisplay screenDisplay = ArcMap.Document.ActiveView.ScreenDisplay;

		// Constants
		screenDisplay.StartDrawing(screenDisplay.hDC, (System.Int16)esriScreenCache.esriNoScreenCache);
		// Explicit Cast
		IRgbColor rgbColor = new RgbColorClass();
		rgbColor.Red = 255;
		rgbColor.Transparency = 75;

		IColor color = rgbColor; // Implicit Cast
		ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass();
		simpleFillSymbol.Color = color;

		//Draw geometry
		ISymbol symbol = simpleFillSymbol as ISymbol; // Dynamic Cast
		IRubberBand rubberBand = new RubberPolygonClass();
		IGeometry geometry = rubberBand.TrackNew(screenDisplay, symbol);
			
		//check for valid geometery
		if (geometry != null)
		{
			screenDisplay.SetSymbol(symbol);
			screenDisplay.DrawPolygon(geometry);
			screenDisplay.FinishDrawing();

			//Open addattributes wpf form
			AddAtrributesView addAtrributesView = new AddAtrributesView(geometry);
			addAtrributesView.ShowInTaskbar = false;
			addAtrributesView.ShowDialog();

			ArcMap.Document.ActivatedView.Refresh();
		}
	}	
}