prs/prs.desktop/Panels/Suppliers/Bills/SupplierBillEditLayout.xaml

<dynamicGrid:DynamicEditorGridLayout
    x:Class="PRSDesktop.SupplierBillEditLayout"
    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:local="clr-namespace:PRSDesktop"
    xmlns:dynamicGrid="clr-namespace:InABox.DynamicGrid;assembly=InABox.Wpf"
    xmlns:sf="http://schemas.syncfusion.com/wpf"
    mc:Ignorable="d" 
    d:DesignHeight="450" d:DesignWidth="800">

    <Grid DataContext="{Binding RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type local:SupplierBillEditLayout}}}">
        
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        
        <dynamicGrid:DynamicTabControl 
            x:Name="Editors"
            Grid.Row="0"
            SelectionChanged="Editors_SelectionChanged"
            SeparatorMargin="4"/>
        
        <sf:SfGridSplitter 
            Grid.Row="1" 
            Height="4"
            HorizontalAlignment="Stretch"
            Background="Transparent"
            ResizeBehavior="PreviousAndNext"
            Template="{StaticResource HorizontalSplitter}"
            PreviewStyle="{StaticResource HorizontalSplitterPreview}"/>
        
        <dynamicGrid:DynamicTabControl 
            x:Name="OtherPages"
            Grid.Row="2" 
            Margin="0,0,0,0"
            SelectionChanged="Editors_SelectionChanged"
            TabStripPlacement="Bottom">
            <dynamicGrid:DynamicTabControl.RightPanel>
                <Border BorderThickness="0" HorizontalAlignment="Stretch" SizeChanged="DocumentWidthChanged">
                    <ContentControl 
                        x:Name="DocumentControl"/>
                </Border>
            </dynamicGrid:DynamicTabControl.RightPanel>
        </dynamicGrid:DynamicTabControl>
        
        
    </Grid>
</dynamicGrid:DynamicEditorGridLayout>