ScrollIntoView on datagrid won't work if to many items are added...

hey,

if i use ScrolIntoView on a datagrid , it won't work if ti add to many items to the View. Means, during runtime i fill the datagrid with approximatly 500 items. After all items are added in Need to select and scrollintoview a particular Item. But this doesn't happen, cause (i suggest) the datagridis filled within a second thread, and is not ready if my code set the selecteditem and the scrollintoview method. Sooo, is there anyone with experience or is there an Event that i can use to handle the Situation???

thanks and bye