private void helpStatusCombobox_SelectionChanged(StatusCostumer item, int index)
        {
            List <GuestRequest> afterFilter = myBL.groupByStatus().AllElementsForKey(item);

            indexStatus  = index;
            SelectStatus = StatusList[indexStatus];
            Refresh(guestRequests, afterFilter);
        }
        private void StatusCombobox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (StatusCombobox.SelectedItem == null)
            {
                indexStatus            = -1;
                StatusClear.Visibility = Visibility.Hidden;
                return;
            }
            StatusCostumer Status = (StatusCostumer)StatusCombobox.SelectedItem;

            StatusCombobox.IsEnabled = false;
            StatusClear.Visibility   = Visibility.Visible;
            helpStatusCombobox_SelectionChanged(Status, StatusCombobox.SelectedIndex);
        }