XamarinDevDays/Demos/app-tasks/DevDaysTasks.UWP/App.xaml

<Application
    x:Class="DevDaysTasks.UWP.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:DevDaysTasks.UWP"
    RequestedTheme="Light">

</Application>