private void DrawEllipse(Point point, string toolTip)
        {
            var el = _ellipseCreator.Create(point);

            el.ToolTip = toolTip;
            _canvas.Children.Add(el);
        }
 private Ellipse CreateEllipse(Point point, EllipseCreator creator)
 {
     return(creator.Create(point));
 }