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:reactiveui="http://reactiveui.net"
        xmlns:inkforge="app:InkForge"
        xmlns:vm="using:InkForge.Desktop.ViewModels"
        mc:Ignorable="d"
        Width="800"
        Height="450"
        x:Class="InkForge.Desktop.Views.MainWindow"
        x:DataType="vm:AppViewModel"
        Title="MainWindow"
        inkforge:TopLevels.Register="{CompiledBinding}">
  <DockPanel>
    <NativeMenuBar />

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