Listview Item Animation and Delay

Hi there. I'm having trouble getting each item in a ListView to show up at separate times(like half a second apart each), similar to Google+ where each item animates in separately. I have a ScaleTo animation on the ViewCell itself but they still all appear at the same time. I've also monkeyed around with Task.Delay() but might be placing it in the incorrect location. Anyone have any guidance on the issue?