gistfile1.txt

using System;
using System.Drawing;
using System.Linq;

using MonoTouch.Foundation;
using MonoTouch.MessageUI;
using MonoTouch.UIKit;

[Register("AppDelegate")]
public class AppDelegate : UIApplicationDelegate
{
	public UIViewController MainController { get; set; }

	public UIWindow Window { get; set; }

	public override bool FinishedLaunching(UIApplication application,
		NSDictionary launchOptions)
	{
		Window = new UIWindow(UIScreen.MainScreen.Bounds);

		//MainController = new MyTabController("Some Value");
		MainController = new MySendEmailController();

		Window.RootViewController = MainController;

		Window.MakeKeyAndVisible();

		return true;
	}

}

public class MySendEmailController : UITabBarController
{

	private MyEmailScreen _sendEmailScreen;
	private UIViewController _dummyTab;

	public override void ViewDidLoad()
	{
		base.ViewDidLoad();

		_sendEmailScreen = new MyEmailScreen();
		_sendEmailScreen.View.BackgroundColor = UIColor.Black;
		_sendEmailScreen.Title = "Send Email";

		_dummyTab = new UIViewController();
		_dummyTab.Title = "Green";
		_dummyTab.View.BackgroundColor = UIColor.Green;

		var tabs = new UIViewController[]{
			_sendEmailScreen, _dummyTab
		};
		ViewControllers = tabs;

		SelectedViewController = _sendEmailScreen;
	}

}

public class MyEmailScreen : UIViewController
{
	private UIButton _button;

	private MFMailComposeViewController _mailController;

	public override void ViewDidLoad()
	{
		base.ViewDidLoad();

		_button = new UIButton(new RectangleF(0,0, View.Bounds.Width, 100));
		_button.SetTitle("Click me", UIControlState.Normal);
		_button.TouchUpInside +=(sender, args) => 
		{
			_mailController = new MFMailComposeViewController();

			_mailController.SetSubject("Can't dismiss me");

			_mailController.SetMessageBody("Cant dismiss on opening a second time", false);

			_mailController.Finished += FinishedSendingEmail;

			PresentViewController(_mailController, true, null);
		};

		Add(_button);
	}

	private void FinishedSendingEmail(object s, MFComposeResultEventArgs args)
	{
		Console.WriteLine (args.Result.ToString ());
		this.InvokeOnMainThread (() => {
			_mailController.DismissViewController (true, null);
		});
		// note: do not call Dispose manually since it's still being used by iOS
		// instead let the GC do it's job (that will happen once iOS does not need it anymore)
		_mailController.Dispose ();
		_mailController = null;
	}
}