Programatically scroll to bottom of ListView

Using a ListView, how can I do the following:

• Scroll to the bottom of the ListView automatically, with or without animation
• Start the ListView at the bottom when the parent view (StackLayout, if this matters) is pushed to the top

Thanks,
Spencer

(P.S., sorry about this - this is a duplicate of this post that was not marked as a question - please delete: forums.xamarin.com/discussion/19937/scroll-to-bottom-of-listview-and-start-at-bottom)