prs/prs.desktop/Panels/Jobs/Requisitions/JobRequisitionPanel.xaml

<UserControl
    x:Class="PRSDesktop.JobRequisitionPanel"
    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"
    mc:Ignorable="d"
    d:DesignHeight="450" d:DesignWidth="800">

    <dynamicgrid:DynamicSplitPanel x:Name="SplitPanel"  AnchorWidth="500" View="Combined" AllowableViews="Combined,Detail"
                                   OnChanged="SplitPanel_OnChanged">
        
        <dynamicgrid:DynamicSplitPanel.Header>
            <Border BorderBrush="Gray" BorderThickness="0.75" Background="WhiteSmoke" Height="25">
                <Label Content="Requisitions" HorizontalContentAlignment="Center"
                       VerticalContentAlignment="Center" />
            </Border>
        </dynamicgrid:DynamicSplitPanel.Header>

        <dynamicgrid:DynamicSplitPanel.Master>
            <local:JobRequisitionGrid x:Name="Requisitions" OnSelectItem="Requisitions_OnSelectItem" />
        </dynamicgrid:DynamicSplitPanel.Master>

        <dynamicgrid:DynamicSplitPanel.Detail>
            <local:JobRequisitionItemGrid x:Name="Items" />
        </dynamicgrid:DynamicSplitPanel.Detail>

    </dynamicgrid:DynamicSplitPanel>

</UserControl>