inabox/InABox.DynamicGrid/Layouts/VerticalDynamicEditorGridLayout.xaml

<local:DynamicEditorGridLayout x:Class="InABox.DynamicGrid.VerticalDynamicEditorGridLayout"
             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:InABox.DynamicGrid"
             xmlns:sf="http://schemas.syncfusion.com/wpf"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <local:DynamicTabControl x:Name="Editors"
                                 Grid.Row="0"
                                 SelectionChanged="Editors_SelectionChanged"/>
        <sf:SfGridSplitter Grid.Row="1"
                           Height="4"
                           HorizontalAlignment="Stretch"
                           Background="Transparent"
                           ResizeBehavior="PreviousAndNext"
                           Template="{StaticResource HorizontalSplitter}"
                           PreviewStyle="{StaticResource HorizontalSplitterPreview}"/>
        <local:DynamicTabControl x:Name="OtherPages"
                                 Grid.Row="2"
                                 SelectionChanged="Editors_SelectionChanged"
                                 TabStripPlacement="Bottom"/>
    </Grid>
</local:DynamicEditorGridLayout>