Hi, I have some problems and have no idea, how to show a dialog popup on SavingContent event in method HandleAsync. Some code here:

     public class ContentSavingNotificationHandler : INotificationAsyncHandler<ContentSavingNotification>
  {
    private readonly IContentService contentService;
    private readonly IEventService eventService;
    public ContentSavingNotificationHandler(IContentService contentService
      , IEventService eventService)
    {
      this.contentService = contentService;
      this.eventService = eventService;
    }
    public Task HandleAsync(ContentSavingNotification notification, CancellationToken cancellationToken)
    {
      if(eventService.GetSomething())
      // want to show popup from here
    }
  }

has somebody idea how to do it?