aistudio-wpf-diagram/Dragablz/DragablzDemo/LayoutManagementExample.xaml

<UserControl x:Class="DragablzDemo.LayoutManagementExample"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:dragablzDemo="clr-namespace:DragablzDemo"
             xmlns:dragablz="clr-namespace:Dragablz;assembly=Dragablz"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300"
             d:DataContext="{d:DesignInstance dragablzDemo:LayoutManagementExampleViewModel, IsDesignTimeCreatable=False}">
    <UserControl.Resources>
        <DataTemplate DataType="{x:Type dragablzDemo:TabablzControlProxy}">
            <StackPanel Orientation="Horizontal">
                <TextBlock>TabablzControl. Operations:</TextBlock>
                <Button Command="{Binding SplitHorizontallyCommand}">Split Horizontally</Button>
                <Button Command="{Binding SplitVerticallyCommand}">Split Vertically</Button>                
                <TextBlock>Ratio:</TextBlock>
                <Slider Value="{Binding SplitRatio}" Width="160" />
            </StackPanel>            
        </DataTemplate>
    </UserControl.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Button Command="{Binding QueryLayoutsCommand}">Query Layouts</Button>            
        <TreeView Grid.Row="1" ItemsSource="{Binding RootNodes}" x:Name="TreeView">
            <TreeView.Resources>
                <DataTemplate DataType="{x:Type dragablzDemo:TabablzControlProxy}">
                    <TextBlock>TabablzControl</TextBlock>
                </DataTemplate>
            </TreeView.Resources>
            <TreeView.ItemContainerStyle>
                <Style TargetType="{x:Type TreeViewItem}">
                    <Setter Property="IsExpanded" Value="True" />
                </Style>
            </TreeView.ItemContainerStyle>
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate DataType="{x:Type dragablzDemo:TreeNode}" 
                                          ItemsSource="{Binding Children}">
                    <ContentControl Content="{Binding Content}" />
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>            
        </TreeView>
        <ContentControl Grid.Row="2" Content="{Binding ElementName=TreeView, Path=SelectedItem.Content}" />
    </Grid>
</UserControl>