lets do this

    If I leave the MUX nuget out of the project, I'll get a compile error in
    App.xaml:

    ```
    ...OpenConsole\src\cascadia\TerminalApp\App.xaml(21,40): XamlCompiler error WMC0001: Unknown type 'XamlControlsResources' in XML namespace 'using:Microsoft.UI.Xaml.Controls'
    ```

    If I add it back to the project, it works

src/cascadia/TerminalApp/App.xaml

@@ -18,7 +18,7 @@ the MIT License. See LICENSE in the project root for license information. -->
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
                 <!-- Include the MUX Controls resources -->
-                <!-- <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls"/> -->
+                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls"/>
                 <ResourceDictionary>
 
                     <!-- We're going to apply this style to the root Grid acting

src/cascadia/TerminalApp/TerminalApp.vcxproj

@@ -151,8 +151,9 @@
     </Link>
   </ItemDefinitionGroup>
   <Import Project="$(OpenConsoleDir)src\common.build.post.props" />
+
   <Import Project="$(OpenConsoleDir)src\cppwinrt.build.post.props" />
-  <!-- <Import Project="..\..\..\packages\Microsoft.UI.Xaml.2.1.190405001-prerelease\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\..\..\packages\Microsoft.UI.Xaml.2.1.190405001-prerelease\build\native\Microsoft.UI.Xaml.targets')" /> -->
+  <Import Project="..\..\..\packages\Microsoft.UI.Xaml.2.1.190405001-prerelease\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\..\..\packages\Microsoft.UI.Xaml.2.1.190405001-prerelease\build\native\Microsoft.UI.Xaml.targets')" />
   <!-- <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>