Silverlight Control Toolkit TreeView not rendering items

Question

I'm trying to build a SL app with a TreeView in it. Here's my XAML:

<UserControl xmlns:controls="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Toolkit"
             xmlns:tkwin="clr-namespace:System.Windows;assembly=System.Windows.Controls.Toolkit"
             xmlns:basics="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"             
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="SL.MyApp.Page"
    Width="800" Height="600">
    <controls:DockPanel>        
        <controls:TreeView Name="siteTree" controls:DockPanel.Dock="Left" Width="150">
            <controls:TreeView.ItemTemplate>
                <tkwin:HierarchicalDataTemplate ItemsSource="{Binding Children}">
                    <StackPanel Orientation="Horizontal">                        
                        <TextBlock Text="{Binding Name}"/>
                    </StackPanel>
                </tkwin:HierarchicalDataTemplate>   
            </controls:TreeView.ItemTemplate>
        </controls:TreeView> 
        <basics:TabControl controls:DockPanel.Dock="Right" TabStripPlacement="Top">
            <basics:TabItem Header="Sites"></basics:TabItem>
            <basics:TabItem Header="Lists"></basics:TabItem>
            <basics:TabItem Header="Users"></basics:TabItem>
        </basics:TabControl>      
    </controls:DockPanel>
</UserControl>

And the relevant codebehind:

namespace SL.MyApp
{
    public partial class Page : UserControl
    {
        private ObservableCollection<WebDescriptor> _webHierarchy = new ObservableCollection<WebDescriptor>(); 

        public Page(WebsSvc.WebsSoapClient websClient)
        {           
            InitializeComponent();

            siteTree.ItemsSource = _webHierarchy;

            websClient.GetWebCollectionCompleted 
                += new EventHandler<SL.SiteBuilder.WebsSvc.GetWebCollectionCompletedEventArgs>(websClient_GetWebCollectionCompleted);
            websClient.GetWebCollectionAsync();

            // TODO: some kind of spinner or progress bar needs to be started.
        }

        void websClient_GetWebCollectionCompleted(object sender, SL.SiteBuilder.WebsSvc.GetWebCollectionCompletedEventArgs e)
        {
            foreach (XElement xe in e.Result.Elements())
            {
                _webHierarchy.Add(ServiceObjectParser<WebDescriptor>.Parse(xe));
            }
        }      
    }
}

Update: The WebDescriptor class:

public class WebDescriptor
{
    public string Title { get; set; }
    public string Url { get; set; }
    public List<WebDescriptor> Children { get; set; }
}

My problem is that nothing renders in the TreeView at all. I have verified that the results obtained in websClient_GetWebCollectionCompleted are valid and correct, but....nothing.

Any ideas?

Answer 1

in websClient_GetWebCollectionCompleted:

siteTree.ItemsSource = _webHierarchy;

Also, change your binding on the TextBlock in the Treeview to be {Binding Title}

Answer 2

After looking at the binding trace output, I finally realized I was trying to bind to a field instead of a property.

Doh!