display .xaml.cs files as sub items in visual studio.
MODIFY
WalletWasabi.Gui/WalletWasabi.Gui.csproj
WalletWasabi.Gui/WalletWasabi.Gui.csproj
<ItemGroup>
<EmbeddedResource Include="**\*.xaml;Assets\*" Exclude="bin\**;obj\**;**\*.xproj;packages\**;@(EmbeddedResource)" />
+
+ <Compile Update="**\*.xaml.cs">
+ <DependentUpon>%(Filename)</DependentUpon>
+ </Compile>
</ItemGroup>
+
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
<DocumentationFile>bin\Debug\netcoreapp2.1\WalletWasabi.Gui.xml</DocumentationFile>
</PropertyGroup>
<DocumentationFile>bin\Release\netcoreapp2.1\WalletWasabi.Gui.xml</DocumentationFile>
</PropertyGroup>
+ <ItemGroup>
+ <None Remove="Tabs\AboutView.xaml" />
+ </ItemGroup>
+
<ItemGroup>
<PackageReference Include="Avalonia.Desktop" Version="0.6.2-build5373-beta" />
</ItemGroup>
<ProjectReference Include="..\WalletWasabi\WalletWasabi.csproj" />
</ItemGroup>
+ <ItemGroup>
+ <EmbeddedResource Update="Tabs\AboutView.xaml">
+ <Generator>MSBuild:Compile</Generator>
+ </EmbeddedResource>
+ </ItemGroup>
+
</Project>

display .xaml.cs files as sub items in visual studio.