/// <summary>
        /// Draws the selection corner.
        /// </summary>
        public void DrawSelectionCorner(DualViewsDrawingModel.Point point)
        {
            RectangleF rectangle = new RectangleF(( float )point.X - ( float )Definitions.SELECTION_CORNER_RADIUS, ( float )point.Y - ( float )Definitions.SELECTION_CORNER_RADIUS, ( float )Definitions.SELECTION_CORNER_DOUBLE_RADIUS, ( float )Definitions.SELECTION_CORNER_DOUBLE_RADIUS);

            _graphics.DrawEllipse(Pens.Red, rectangle);
            _graphics.FillEllipse(Brushes.White, rectangle);
        }
 /// <summary>
 /// Draws the selection corner.
 /// </summary>
 public void DrawSelectionCorner(DualViewsDrawingModel.Point point)
 {
     Windows.UI.Xaml.Shapes.Ellipse drawingPageCanvasEllipse = new Windows.UI.Xaml.Shapes.Ellipse();
     drawingPageCanvasEllipse.Width  = Definitions.SELECTION_CORNER_DOUBLE_RADIUS;
     drawingPageCanvasEllipse.Height = Definitions.SELECTION_CORNER_DOUBLE_RADIUS;
     drawingPageCanvasEllipse.Stroke = new SolidColorBrush(Colors.Red);
     drawingPageCanvasEllipse.Fill   = new SolidColorBrush(Colors.White);
     _canvas.Children.Add(drawingPageCanvasEllipse);
     Canvas.SetLeft(drawingPageCanvasEllipse, point.X - Definitions.SELECTION_CORNER_RADIUS);
     Canvas.SetTop(drawingPageCanvasEllipse, point.Y - Definitions.SELECTION_CORNER_RADIUS);
 }