AvaloniaProject/AvaloniaApplication4/Views/MainPage.axaml

<UserControl 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:vm="using:AvaloniaApplication4.ViewModels"
			 x:DataType="vm:MainPageViewModel"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="AvaloniaApplication4.Views.MainPage">
	<Grid>
		<Grid.ColumnDefinitions>
			<ColumnDefinition Width="1*"/>
			<ColumnDefinition Width="3*"/>
		</Grid.ColumnDefinitions>
		<UserControl Content="{Binding MenuUserControl}" Grid.Column="0"/>
		<UserControl Content="{Binding GlobalsData.GlobalUserControl}" Grid.Column="1"/>
	</Grid>
</UserControl>