private void ExecuteDeleteMaintenance(object parameter)
        {
            int _id = ((MaintenanceRecordModel)parameter).ID;

            if (_id != 0)
            {
                IMessageBoxService _msgbox = new MessageBoxService();

                if (_msgbox.ShowMessage("Do you want to delete this Maintenance?", "Deleting Maintenance", GenericMessageBoxButton.OKCancel, GenericMessageBoxIcon.Question) == GenericMessageBoxResult.OK)
                {
                    DeleteItem(_id, "MaintenanceRecords");
                    Maintenance.Remove((MaintenanceRecordModel)parameter);
                }
                _msgbox = null;
            }
        }