public async void Execute(object parameter)
        {
            _addEntryViewModel.ErrorMessage = string.Empty;

            try
            {
                var booking = await _bookingService.AddBooking(_addEntryViewModel.Title, _addEntryViewModel.Amount, _addEntryViewModel.Date, _addEntryViewModel.BookingOption, _addEntryViewModel.SelectedCategory, _addEntryViewModel.SelectedBankAccount);

                //_overviewViewModel.Bookings.Add(new BookingPanelViewModel(_overviewViewModel, booking, _bookingService, _dialogService));

                _overviewViewModel.GetYears();

                Cleanup();
            }
            catch (Exception e)
            {
                _addEntryViewModel.ErrorMessage = $"Es ist ein Fehler aufgetreten. {e.Message}";
            }
        }