scroll wpf listview specific line

wpf, browserlike app.

i got page containing listview. after job pagefunction i supplement line listview, wish confine new line view:

  listviewitem vigilant = itemcontainergenerator.containerfromindex(index) listviewitem;
  (item != null)
    scrollintoview(item);

this works. enlarged new line perspective line gets concentration should.

problem is, things don't work line visible.

if line visible, there listviewitem line generated, itemcontainergenerator.containerfromindex advantage null.

but but item, i confine line view? there any proceed confine final line (or anywhere) but wanting an listviewitem?