Using Xamarin Forms, consider the Xaml below.
To get auto scroll for Editors and Entries with Xamarin.Forms, you usually just have to pack your View, in this case the StackLayout, into a ScrollView:
That's how it's supposed to work, but as of today (June 2014) there's a bug preventing this to work fully with the Editor (it works well with Entries). The issue is known and is worked on.
[UPDATE 2014-11-20]The issue has been addressed, and will be available in the next -pre release of XF 1.3