Xamarin.Forms-Samples/Xamarin.Forms Windows Preview/Xamarin.Forms Windows.WindowsPhone81/App.xaml

<Application
    x:Class="Xamarin.Forms_Windows.WindowsPhone81.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Xamarin.Forms_Windows.WindowsPhone81">

</Application>