Can't find any way to change the state of the screen programatically

I have the following code:

using Terminal.Gui;

namespace TestConsole
{
    public class App : Window
    {
        private Label _label;
        public App() : base("Test Screen")
        {
            X = 0;
            Y = 0;
            Width = Dim.Fill();
            Height = Dim.Fill();
            _label = new Label("this is a label")
            {
                X = 0,
                Y = 0,
                Width = Dim.Fill(),
            };
            this.Add(_label);
        }
        public void SetNewText(string newText)
        {
            Application.MainLoop.Invoke(() =>
            {
                _label.Text = newText;
            });
        }
    }
    class Program
    {
        static void Main()
        {
            Application.Init();
            App _consoleApp = new App();
            var runToken = Application.Begin(_consoleApp);
            Application.RunLoop(runToken);
            _consoleApp.SetNewText("this is a new text");
            Application.End(runToken);
        }
    }
}

The point is to open a screen, and later on, depending on some further processes, I want to update what’s on the screen. But whatever I try doesn’t work. What is done wrong in my example?

[paillave]

ok, I searched yesterday for ages with no solution, but it seems I simply was in lack of inspiration. Here is how the App class should be used:

    class Program
    {
        static void Main()
        {
            Application.Init();
            App _consoleApp = new App();
            using (Application.RunState runToken = Application.Begin(_consoleApp))
            {
                Task.Run(() => Application.RunLoop(runToken));
                _consoleApp.SetNewText("this is a new text");
                Thread.Sleep(5000);
            }
        }
    }

[BDisp]

Put also “Thread.Sleep(5000);” before “_consoleApp.SetNewText(“this is a new text”);” and you’ll see the old label text before changed to the new one!