private void BtnTwitterPINAuth_Click(object sender, RoutedEventArgs e)
        {
            string errMsg1 = "PIN 번호가 잘못 입력되었습니다.";
            string errMsg2 = "PIN 번호는 비어있을 수 없습니다.";

            if (tbTwitterPIN.Text.IsNullOrEmpty())
            {
                tbTwitterPINMsg.Text       = errMsg2;
                tbTwitterPINMsg.Visibility = Visibility.Visible;
                return;
            }


            string pinNumber = tbTwitterPIN.Text;

            credentials.InputPIN(pinNumber);
            try
            {
                tokenizer.CredentialsCertification(credentials);
                SettingManager.RaiseTwitterCredentialChanged();
                tbTwitterPINMsg.Visibility  = Visibility.Hidden;
                wbTwitter.Visibility        = Visibility.Hidden;
                tcTwitterAuth.SelectedIndex = 2;
                tbTwitterPIN.Clear();

                runTwitterKey.Text    = tbTwitterKey.Text;
                runTwitterSecret.Text = _hiddenText;
            }
            catch (CredentialsTypeException)
            {
                tbTwitterPINMsg.Text       = errMsg1;
                tbTwitterPINMsg.Visibility = Visibility.Visible;
                string url = GetTwitterURL();
                wbTwitter.Navigate(url);
            }
        }