public ChartCanvas(CGRect rect)
: base(rect)
{
ContentMode = UIViewContentMode.Redraw;
AutoresizingMask = UIViewAutoresizing.All;
BackColor = Color.Wheat;
var panelRect = new CGRect (rect.X,rect.Y,rect.Width,rect.Height-20 / UIScreen.MainScreen.Scale);
panelRect.Inflate (-20 / UIScreen.MainScreen.Scale,-20 / UIScreen.MainScreen.Scale);
panel1 = new PlotPanel (panelRect);
panel1.BackColor = Color.AliceBlue;
AddSubview (panel1);
panel1.Paint += PlotPanelPaint;
}