public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
{
window = new UIWindow (UIScreen.MainScreen.Bounds);
viewController = new MTExample4_1ViewController ();
viewController.View.AddSubview (new ChartCanvas (window.Bounds));
window.RootViewController = viewController;
window.MakeKeyAndVisible ();
return true;
}