public LoginViewModel(ILoginService loginService, ISettingsService settingsService)
{
this.loginService = loginService;
this.settingsService = settingsService;
this.LoginCommand = new RelayCommand(async () =>
{
Debug.WriteLine("Login...");
var token = await loginService.GetAccessTokenAsync(Username, Password);
await this.settingsService.SaveItemAsync(token, "access_token");
Messenger.Default.Send(new NavigationMessage(typeof(FriendsPage), null));
});
}