prs/prs.desktop/Panels/DataEntry/DataEntryPanel.xaml

<UserControl x:Class="PRSDesktop.DataEntryPanel"
             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:dynamic="clr-namespace:InABox.DynamicGrid;assembly=InABox.Wpf"
             xmlns:local="clr-namespace:PRSDesktop"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <dynamic:DynamicSplitPanel x:Name="_panel" View="Combined" AnchorWidth="500" Anchor="Master" AllowableViews="Combined" OnChanged="_panel_OnOnChanged">
            
            <dynamic:DynamicSplitPanel.Master>
                <local:DataEntryList x:Name="_documents" SelectionChanged="ScanPanel_OnSelectScan" />
            </dynamic:DynamicSplitPanel.Master>
            
            <dynamic:DynamicSplitPanel.Detail>
                <Border BorderBrush="Gray" BorderThickness="0.75" x:Name="DetailBorder" DockPanel.Dock="Bottom" Margin="0,0,0,0">
                    <dynamic:EmbeddedDynamicEditorForm x:Name="Editor" HideButtons="True"/>
                </Border>
            </dynamic:DynamicSplitPanel.Detail>
            
        </dynamic:DynamicSplitPanel>
    </Grid>
</UserControl>