private void betolt_Click(object sender, RoutedEventArgs e)
        {
            Betoltes be = Betoltes.getInstance();

            be.AblakMegjelenit();
            this.Close();
        }
 public static Betoltes getInstance()
 {
     if (uniqueInstance == null)
     {
         uniqueInstance = new Betoltes();
     }
     return(uniqueInstance);
 }