message: Create TimelineViewModel on Login
diff: @@ -21,7 +21,7 @@ namespace TogglDesktop
  public Timeline()
  {
  InitializeComponent();
  - Loaded += (s, e) => ViewModel = new TimelineViewModel();
  + Toggl.OnLogin += (open, userId) => ViewModel = new TimelineViewModel();
  }
  private void RecordActivityInfoBoxOnMouseEnter(object sender, MouseEventArgs e)
  