occt/samples/CSharp/WPF_D3D/App.xaml

<Application x:Class="IE_WPF_D3D.App"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    StartupUri="MainWindow.xaml">
    <Application.Resources>
         
    	<ResourceDictionary>
    		<ResourceDictionary.MergedDictionaries>
    			<ResourceDictionary Source="Simple Styles.xaml"/>
    		</ResourceDictionary.MergedDictionaries>
    	</ResourceDictionary>
         
    </Application.Resources>
</Application>