private void _btnSignin_Click(object sender, RoutedEventArgs e)
        {
            var signin = new JSNotifySignInWindow
                {
                    EndpointUrl = new Uri(string.Format("https://{0}/idsrv/issue/jsnotify?realm={1}&tokenType={2}",
                                                Constants.IdSrv,
                                                Constants.Realm,
                                                "http://schemas.xmlsoap.org/ws/2009/11/swt-token-profile-1.0"))
                };

            signin.SignIn();
        }
 void _signin_SignedIn(object sender, JSNotifySignInWindow.SignedInEventArgs e)
 {
     _response = e.Response;
     _txtDebug.Text = e.Response.AccessToken;
 }