MainWindow.xaml

<dx:ThemedWindow
    x:Class="DXSample.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:ViewModels="clr-namespace:DXSample.ViewModels"
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
    xmlns:dxdo="http://schemas.devexpress.com/winfx/2008/xaml/docking"
    Title="MainWindow"
    Width="1000"
    Height="800">
    <Grid>
        <Grid.DataContext>
            <ViewModels:MainViewModel />
        </Grid.DataContext>
        <dxdo:DockLayoutManager x:Name="dlm" ItemsSource="{Binding Panels}">
            <dxdo:DockLayoutManager.Resources>
                <Style x:Key="BaseStyle" TargetType="dxdo:LayoutPanel">
                    <Setter Property="Caption" Value="{Binding Caption}" />
                    <Setter Property="ContentTemplate">
                        <Setter.Value>
                            <DataTemplate>
                                <TextBlock Text="{Binding Content}" />
                            </DataTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
                <Style BasedOn="{StaticResource BaseStyle}" TargetType="dxdo:LayoutPanel" />
                <Style BasedOn="{StaticResource BaseStyle}" TargetType="dxdo:DocumentPanel" />
            </dxdo:DockLayoutManager.Resources>
            <dxdo:LayoutGroup x:Name="root">
                <dxdo:LayoutGroup Name="layoutGroup" />
                <dxdo:DocumentGroup Name="documentGroup" />
            </dxdo:LayoutGroup>
        </dxdo:DockLayoutManager>
    </Grid>
</dx:ThemedWindow>