cfc/cfc-desktop-pet/src/XafPet.Desktop/App.xaml

<Application x:Class="XafPet.Desktop.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             StartupUri="MainWindow.xaml">
    <Application.Resources></Application.Resources>
</Application>