public GraphHeaderView ()
 {
     dv = new DrawingView(new RectangleF(0,0, chartWidth, chartHeight), 0, 0, 0);
     
     this.AddSubview(dv );
 }
 public GraphHeaderView ()
 {
     dv = new DrawingView (new CGRect (0, 0, chartWidth, chartHeight), 0, 0, 0);
     
     this.AddSubview (dv);
 }