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 View="Combined" AnchorWidth="500">
            <dynamic:DynamicSplitPanel.Header>
                <Border BorderBrush="Gray" BorderThickness="0.75" Background="WhiteSmoke" Height="25">
                    <Label Content="Data Entry" HorizontalContentAlignment="Center"
                       VerticalContentAlignment="Center" />
                </Border>
            </dynamic:DynamicSplitPanel.Header>
            <dynamic:DynamicSplitPanel.Master>
                <local:ScanPanel x:Name="ScanPanel" OnSelectAppliesTo="ScanPanel_OnSelectAppliesTo"/>
            </dynamic:DynamicSplitPanel.Master>
            <dynamic:DynamicSplitPanel.Detail>
                <Grid x:Name="DetailGrid">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="Auto"/>
                        <ColumnDefinition Width="*"/>
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto"/>
                        <RowDefinition Height="*"/>
                    </Grid.RowDefinitions>
                    <Label Content="Type"
                           Margin="5"
                           Grid.Row="0" Grid.Column="0"/>
                    <ComboBox Name="TypeBox"
                              Margin="0,5,5,5"
                              Grid.Row="0" Grid.Column="1"
                              VerticalContentAlignment="Center"
                              SelectionChanged="TypeBox_SelectionChanged"/>
                    <Label Content="Item"
                           Margin="5"
                           Grid.Row="0" Grid.Column="2"/>
                    <dynamic:EmbeddedDynamicEditorForm x:Name="Editor"
                                                       Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="4"/>
                </Grid>
            </dynamic:DynamicSplitPanel.Detail>
        </dynamic:DynamicSplitPanel>
    </Grid>
</UserControl>