EdEmulator/EdTestEmulator/Views/MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:vm="using:EdTestEmulator.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="EdTestEmulator.Views.MainWindow"
        x:DataType="vm:MainWindowViewModel"
        Icon="/Assets/avalonia-logo.ico"
        Title="EdTestEmulator">

    <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>

	<DockPanel>
		<Menu DockPanel.Dock="Top">
			<MenuItem Header="_File">
				<MenuItem Header="_Open..."/>
				<MenuItem Header="_Open exchange folder" Command="{Binding OpenExchangeFolder}"/>
				<Separator/>
				<MenuItem Header="_Exit"/>
			</MenuItem>
			<MenuItem Header="_Edit">
				<MenuItem Header="Start"/>
				<MenuItem Header="Next"/>
				<MenuItem Header="Stop"/>
				<MenuItem Header="Settings"/>
				<MenuItem Header="Clear exchange folder"/>
				<MenuItem Header="Show doc" Command="{Binding OpenXmlMessage}"/>
				<MenuItem Header="Select exernal msg" Command="{Binding SelectMessageManual}" CommandParameter="{Binding $parent[Window]}"/>
			</MenuItem>
		</Menu>
		<Grid ColumnDefinitions="*, 4, *">
			<TabControl Grid.Column="0">
				<TabItem Header="Процедуры">
					<DataGrid	MinWidth="100"
						ItemsSource="{Binding Procedures}"
								AutoGenerateColumns="True"
								CanUserReorderColumns="True"
								CanUserResizeColumns="True"
								CanUserSortColumns="False"
								IsReadOnly="True"
								GridLinesVisibility="All"
								BorderThickness="1"
								BorderBrush="Gray"
								SelectedItem="{Binding SelectedProcedure}">
					</DataGrid>
				</TabItem>
			</TabControl>
			
			<GridSplitter Grid.Column="1" Background="LightGray" ResizeDirection="Columns"/>

			<TabControl Grid.Column="2">
				<TabItem Header="Сообщения">
					<DataGrid	ItemsSource="{Binding Messages}"
								AutoGenerateColumns="True"
								CanUserReorderColumns="True"
								CanUserResizeColumns="True"
								CanUserSortColumns="False"
								IsReadOnly="True"
								GridLinesVisibility="All"
								BorderThickness="1"
								BorderBrush="Gray"
								SelectedItem="{Binding SelectedMessage}">
					</DataGrid>
				</TabItem>
				<TabItem Header="Документы">
					
				</TabItem>
				<TabItem Header="Электронный архив">

				</TabItem>
			</TabControl>
			
		</Grid>

	</DockPanel>


</Window>