Drawing in MonoMac

Question

I am trying to draw some circles on a view in MonoMac, but I don't have a single idea where to start from. Under .NET on Windows I'd do something like

Canvas canv =  new Canvas();
Ellipse ell = new Ellipse();
Canvas.SetLeft(ell, 5);
Canvas.SetTop(ell, 5);
canv.Children.Add(ell);

Thanks.