vue-java-tutorials/CSharp/WPFTutorial/WPF-14-StackPanel/App.xaml

<Application x:Class="WPF_14_StackPanel.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:WPF_14_StackPanel"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
         
    </Application.Resources>
</Application>