CopyDemoAvalonia/TestRepeat/Views/MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:vm="using:TestRepeat.ViewModels"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="TestRepeat.Views.MainWindow"
        x:DataType="vm:MainWindowViewModel"
        Icon="/Assets/avalonia-logo.ico"
        Title="TestRepeat">

    <Design.DataContext>
        <!-- This only sets the DataContext for the previewer in an IDE,
             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
        <vm:MainWindowViewModel/>
    </Design.DataContext>

	<Grid 
		ShowGridLines="True"
		RowDefinitions="80, *, 80"
		ColumnDefinitions="100, *">
		<TextBlock
			Text="Заголовок"
			Grid.ColumnSpan="2"
			HorizontalAlignment="Center"
			VerticalAlignment="Center"/>
		<TextBlock
			Text="Меню"
			Grid.Row="1"
			HorizontalAlignment="Center"
			VerticalAlignment="Center"/>
		<TextBlock
			Text="Подвал"
			Grid.ColumnSpan="2"
			Grid.Row="2"
			HorizontalAlignment="Center"
			VerticalAlignment="Center"/>
		<UserControl
			Grid.Row="1"
			Grid.Column="1"
			Content="{Binding Uc}"/>
	</Grid>
</Window>