/// <summary>
        /// btnSaveCred_Click
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSaveCred_Click(object sender, RoutedEventArgs e)
        {
            //var vault = new Windows.Security.Credentials.PasswordVault();
            //vault.Add(new PasswordCredential(this.credsPrevResourceUrl, this.username, this.password));
            var  credentialMgr = CredentialManager.GetInstance();
            bool result        = credentialMgr.AddCredential(this.credsPrevResourceUrl, this.username, this.password);

            if (result)
            {
                CredsFlyout.Hide();
            }
            else
            {
                CredsFlyout.ShowAt(this.GridWebView);
            }
        }
 /// <summary>
 /// btnDontSaveCred_Click
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void btnDontSaveCred_Click(object sender, RoutedEventArgs e)
 {
     CredsFlyout.Hide();
 }