Answer to my question.

I had to hook into BeforeSave event.

and if I cancel the actual event the message can be passed as well but not via speech bubble.

here is a sample code for future reference.

 public static void BeforeSave(object sender, BeforeSaveEventArgs e)
 {
  e.Result = new SaveResult { ErrorMessage = "My error message.", Success = false };
  e.Cancel = true;
 }