[Zope] ZCatalog update question

Hi, I created a news Z class with some attributes, hoping to find them in the Zcatalog. The news-class is Catalog aware, and if i create some new instances of news they automaticaly appear in the catalog! So far, so well. (Btw, I am using Zope 2.3.0). Ok, the new news appears in the catalog tab of my catalog. But if I click on this item in the catalog tab, i have to remark, that it has not been indexed yet!!! There are no value entries behind the keys. That's the reason why i am not able to find some news in my search at once. First I have to go in the Advanced tab and update the catalog. After that the news are indexed and all works fine. Perhabs someone could help me? Is it possibly a bug in 2.3.0 ??? Thank you, Marc