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    <p>Your ItemTemplate is trying to render a "Name" and "Age" property in TextBlocks, but TreeViewItem doesn't have an "Age" property and you aren't setting its "Name".</p> <p>Because you're using an ItemTemplate, there's no need to add TreeViewItems to the tree. Instead, add your Person instances directly:</p> <pre><code>_treeView.Items.Add(new Person { Name = "Sally", Age = 28}); </code></pre> <p>The problem, of course, is that your underlying object ("Person") doesn't have any concept of hierarchy, so there's no simple way to add "Joe" to "Sally". There are a couple of more complex options:</p> <p>You could try handling the TreeView.ItemContainerGenerator.StatusChanged event and wait for the "Sally" item to be generated, then get a handle to it and add Joe directly:</p> <pre><code>public Window1() { InitializeComponent(); var bob = new Person { Name = "Bob", Age = 34 }; var sally = new Person { Name = "Sally", Age = 28 }; _treeView.Items.Add(bob); _treeView.Items.Add(sally); _treeView.ItemContainerGenerator.StatusChanged += (sender, e) =&gt; { if (_treeView.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated) return; var sallyItem = _treeView.ItemContainerGenerator.ContainerFromItem(sally) as TreeViewItem; sallyItem.Items.Add(new Person { Name = "Joe", Age = 15 }); }; } </code></pre> <p>Or, a better solution, you could introduce the hierarchy concept into your "Person" object and use a HierarchicalDataTemplate to define the TreeView hierarchy:</p> <p>XAML:</p> <pre><code>&lt;Window x:Class="TreeTest.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="WindowTree" Height="300" Width="300"&gt; &lt;Grid&gt; &lt;TreeView Name="_treeView"&gt; &lt;TreeView.ItemTemplate&gt; &lt;HierarchicalDataTemplate ItemsSource="{Binding Subordinates}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;TextBlock Text="{Binding Path=Name}" /&gt; &lt;TextBlock Text="{Binding Path=Age}" /&gt; &lt;/StackPanel&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/TreeView.ItemTemplate&gt; &lt;/TreeView&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>CODE:</p> <pre><code>using System.Collections.Generic; using System.Windows; namespace TreeTest { /// &lt;summary&gt; /// Interaction logic for Window1.xaml /// &lt;/summary&gt; public partial class Window1 : Window { public Window1() { InitializeComponent(); var bob = new Person { Name = "Bob", Age = 34 }; var sally = new Person { Name = "Sally", Age = 28 }; _treeView.Items.Add(bob); _treeView.Items.Add(sally); sally.Subordinates.Add(new Person { Name = "Joe", Age = 15 }); } } public class Person { public Person() { Subordinates = new List&lt;Person&gt;(); } public string Name { get; set; } public int Age { get; set; } public List&lt;Person&gt; Subordinates { get; private set; } } } </code></pre> <p>This is a more "data-oriented" way to display your hierarchy and a better approach IMHO.</p>
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    1. USNawed Nabi Zada
    1. USMatt Hamilton
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    1. COBoth your solutions work. Sorry for taking so long to get back to you. I ended up not using a tree in the end, instead implemented a custom hierarchical listbox.
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      1. USWallstreet Programmer
    2. COHooray for Matt! just what i needed (the second solution)
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      1. USYisroel M. Olewski
 

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