private void listBox_Loaded(object sender, RoutedEventArgs e)
        {
            CalendarReader cl = new CalendarReader();

            cl.GoogleMain();
            events = new ObservableCollection <string>(cl.gcevents);
            dates  = new ObservableCollection <string>(cl.dates);
            foreach (string f in events)
            {
                foreach (string d in dates)
                {
                    listBox.Items.Add((f.ToString() + "    " + (d) + "\n"));
                }
            }
        }