Qyoto problem using QFileDialog

using System;
using Qyoto;

namespace testqyotoproject
{

    public static class Program
    {

        [STAThread]
        public static int Main(String[] args)
        {
            new QApplication(args);
            new QyotoApp();
            return QApplication.Exec();
        }
    }



    public class QyotoApp: QWidget
    {
        /// <summary>
        /// Constructor
        /// </summary>
        public QyotoApp()
        {
            WindowTitle = "Qyoto Test Application";

            InitUI();

            Resize(300, 80);
            Move(300, 300);
            Show();
        }




        void InitUI()
        {
            QVBoxLayout vbox = new QVBoxLayout(this);
            QPushButton ok = new QPushButton("Click here to open file dialog", this);
            Connect( ok, SIGNAL("clicked()"), this, SLOT("ShowDialog()"));
            vbox.AddWidget(ok, 0, (uint)AlignmentFlag.AlignCenter);

            this.SetLayout(vbox);
        }




        [Q_SLOT]
        void ShowDialog()
        {
            string selectedFile = QFileDialog.GetOpenFileName(this, "File Open Dialog");

            if (string.IsNullOrEmpty(selectedFile))
            {
                return;
            }

            Console.WriteLine("selected file: " + selectedFile);
        }

    }
}

// end of file