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    <p>This is how I got it to work, thanks Matt!</p> <pre><code>public abstract class ObservableHierarchy&lt;T&gt; { public T Current { get; set; } public ObservableCollection&lt;ObservableHierarchy&lt;T&gt;&gt; Children { get; set; } public ObservableHierarchy( T current, Func&lt;T, IEnumerable&lt;T&gt;&gt; expand ) { this.Current = current; this.Children = new ObservableCollection&lt;ObservableHierarchy&lt;T&gt;&gt;(); foreach ( var item in expand( current ) ) { Children.Add( Create( item ) ); } } protected abstract ObservableHierarchy&lt;T&gt; Create( T item ); } </code></pre> <p>Then I specialize that base class to whatever data class I'm currently using.</p> <pre><code>public class ObservableFolderHierarchy: ObservableHierarchy&lt;FolderEntity&gt; { public ObservableFolderHierarchy( FolderEntity root ) : base( root, x =&gt; x.FolderEntities ) { } protected override ObservableHierarchy&lt;FolderEntity&gt; Create( FolderEntity item ) { return new ObservableFolderHierarchy( item ); } } </code></pre> <p>Slightly modified XAML and it works just great! Changes to the collection or properties of Current updates the TreeView accordingly.</p> <pre><code>&lt;HierarchicalDataTemplate DataType="{x:Type ui:ObservableFolderHierarchy}" ItemsSource="{Binding Children}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Image Source="/UI/Resources/folder.png" Width="16" Height="16"/&gt; &lt;TextBlock Text="{Binding Current.FolderName}"/&gt; &lt;/StackPanel&gt; &lt;/HierarchicalDataTemplate&gt; </code></pre>
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Guidance
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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