public PowerGistPanel()
        {
            InitializeComponent();

            AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;


            GitApiConfig.AlertIfConfigRequired();

            gistClient = new GistClient(GitApiConfig.ClientId, GitApiConfig.ClientSecret, "powershellISEAddin");
            viewModel = new MainViewModel();
            viewModel.Loading = Visibility.Collapsed;

            //navigate to "https://github.com/login/oauth/authorize" 
            webBrowser.Visibility = Visibility.Visible;
            webBrowser.Navigate(gistClient.AuthorizeUrl);
        }
        private async void webBrowser_Navigating(object sender, NavigatingCancelEventArgs e)
        {
            if (e.Uri.AbsoluteUri.Contains("code="))
            {
                e.Cancel = true;
                webBrowser.Visibility = Visibility.Collapsed;

                var authCode = Regex.Split(e.Uri.AbsoluteUri, "code=")[1];

                //get access token
                await gistClient.Authorize(authCode);
                ISEInterop.Config.ObjectModelRoot = HostObject;
                var gistRepo = new GistRepository(gistClient);
                viewModel = new MainViewModel(gistRepo);
                this.DataContext = viewModel;
                await viewModel.Load();
            }
        }