public async void ExecuteLoadPublishedMessagesCommand(object parameter)
        {
            Busy        = true;
            BusyContent = "Loading published voyageplans from VIS";
            await Task.Factory.StartNew(() =>
            {
                var service = new VisService();
                Messages    = new ObservableCollection <PublishedMessageContract>(service.GetPublishedMessages());
            });

            Busy = false;
        }