private void MyDrawObject_DrawComplete(object sender, DrawEventArgs args)
{
outputGraphicsLayer.ClearGraphics();
ESRI.ArcGIS.Client.Geometry.MapPoint point = args.Geometry as ESRI.ArcGIS.Client.Geometry.MapPoint;
point.SpatialReference = MyMap.SpatialReference;
Graphic graphic = new Graphic()
{
Symbol = LayoutRoot.Resources["DefaultMarkerSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol,
Geometry = point
};
inputGraphicsLayer.Graphics.Add(graphic);
if (inputGraphicsLayer.Graphics.Count >= 3)
ConvexButton.IsEnabled = true;
}