InkForge/app/InkForge.Desktop/Views/MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:ifcvm="using:InkForge.Common.ViewModels"
        xmlns:reactiveui="http://reactiveui.net"
        mc:Ignorable="d"
        d:DesignWidth="800"
        d:DesignHeight="450"
        x:Class="InkForge.Desktop.Views.MainWindow"
        x:DataType="ifcvm:AppViewModel"
        Title="InkForge">
    <NativeMenu.Menu>
        <NativeMenu>
            <NativeMenuItem Header="Test" />
        </NativeMenu>
    </NativeMenu.Menu>

    <DockPanel>
        <NativeMenuBar />

        <reactiveui:ViewModelViewHost ViewModel="{CompiledBinding View}" />
    </DockPanel>
</Window>