private void PrepareCreateWindowModel <T>(RequestEditWindowModel <T> editWindowModel) where T : class
 {
     editWindowModel.Stores.Containers = _containerService.GetAllFreeContainerModels(null)
                                         .Select(x => new SelectListItem {
         Value = x.Id.ToString(), Text = $"{x.Number} ({x.ContainerType.Name})"
     })
                                         .ToList()
                                         .AddEmptyElement();
 }