Thanks for advice, but problem is that, I don’t know what the index will have a new item. This should be based on ID of element (which is unique) and then CGridView should add css class “selected” to that element.
But I think I give up this idea, because now I see a new problem. When there will be more elements that limit per page, I should redirect, after adding new item, to page with that item, but I don’t know how to do this with a CGridView. So, now I have 2 big problems.