private void GraphicsLayer_MouseLeftButtonDown(object sender, ESRI.ArcGIS.Client.GraphicMouseButtonEventArgs e)
 {
     if (e.Graphic.Selected)
     {
         e.Graphic.UnSelect();
     }
     else
     {
         e.Graphic.Select();
     }
 }
 private void GraphicsLayer_MouseLeftButtonDown(object sender, ESRI.ArcGIS.Client.GraphicMouseButtonEventArgs e)
 {
     e.Graphic.Selected = !e.Graphic.Selected;
 }