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    <p>This seems to be a bug in the Microsoft WPF DataGrid. You should definitely report it through <a href="https://connect.microsoft.com/default.aspx" rel="nofollow noreferrer">Microsoft Connect</a>, if you haven't already done so.</p> <p>As a workaround, you could use a value converter on your bindings, to stop NULL values on the binding target from being transferred to the binding source, which will cause the <strong>NullReferenceException</strong>. Here is an example of such a converter:</p> <pre><code>// NullToUnsetConverter.cs using System; using System.Windows; using System.Windows.Data; using System.Globalization; namespace MyProject.Controls.Converters { /// &lt;summary&gt; /// Converts &lt;c&gt;null&lt;/c&gt; values to &lt;see cref="DependencyProperty.UnsetValue"/&gt;. /// &lt;remarks&gt; /// This converter is intented for use in situations when the binding target /// does not correctly handle &lt;c&gt;null&lt;/c&gt; values. This is the case for example /// with some WPF UI controls. /// &lt;/remarks&gt; /// &lt;/summary&gt; public class NullToUnsetConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { if (value == null) { return DependencyProperty.UnsetValue; } else { // No conversion applied return value; } } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { // No conversion applied return value; } } } </code></pre> <p>In order to apply the converter to your bindings, you'll have to modify your XAML like this:</p> <pre><code>&lt;Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:cnv="clr-namespace:MyProject.Controls.Converters" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:dg="clr-namespace:Microsoft.Windows.Controls;assembly=WpfToolkit" &gt; &lt;Window.Resources&gt; &lt;x:Array x:Key="people" Type="sys:Object" /&gt; &lt;cnv:NullToUnsetConverter x:Key="NullToUnsetConverter" /&gt; &lt;/Window.Resources&gt; &lt;StackPanel&gt; &lt;dg:DataGrid ItemsSource="{DynamicResource people}" CanUserAddRows="True" AutoGenerateColumns="False"&gt; &lt;dg:DataGrid.Columns&gt; &lt;dg:DataGridTextColumn Header="First" Binding="{Binding First, Converter={StaticResource NullToUnsetConverter}}" /&gt; &lt;dg:DataGridTextColumn Header="Last" Binding="{Binding Last, Converter={StaticResource NullToUnsetConverter}}" /&gt; &lt;/dg:DataGrid.Columns&gt; &lt;/dg:DataGrid&gt; &lt;/StackPanel&gt; &lt;/Window&gt; </code></pre> <p>Alternatively, you could modify the <strong>NullToUnsetConverter.Convert</strong> method to return an <strong>empty string</strong> when the input value is a string, like in your case.</p>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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