BPASmartClient/WPFDemo/App.xaml

<Application
    x:Class="WPFDemo.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WPFDemo"
    StartupUri="TestData.xaml">
    <Application.Resources />
</Application>