TSCHMI_done/MainWindow.xaml

<Window x:Class="ТСЧМИ.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        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:local="clr-namespace:ТСЧМИ"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
        <Grid ShowGridLines="True">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width ="*" />
            <ColumnDefinition Width ="*" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="3*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <GridSplitter Grid.Column="1"  Grid.Row="0" ShowsPreview="False" Width="3" HorizontalAlignment="Left" VerticalAlignment="Stretch" />
        <GridSplitter Grid.Row="1" Grid.ColumnSpan="3" Height="3" HorizontalAlignment="Stretch" VerticalAlignment="Top" />
        <Grid Grid.Row="0" Grid.Column="2" ShowGridLines="True">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
                <RowDefinition Height="2*" />
            </Grid.RowDefinitions>
        </Grid>
    </Grid>
</Window>