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POI need to add an observablecollection to an observablecollection.
 

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    <p>Here is my code and what the output is when I run it. I am really at a loss on this one. Any help would be appreciated.</p> <p>VALIDATIONITEM CLASS:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections.ObjectModel; namespace ValidationWPF.DataSources { public class ValidationItem : ObservableCollection&lt;ValidationItem&gt; { public ValidationItem() { SubItems = new ObservableCollection&lt;ValidationItem&gt;(); } public ObservableCollection&lt;ValidationMessages&gt; Messages { get; set; } public string item { get; set; } public IList&lt;ValidationItem&gt; SubItems { get; set; } public static IList&lt;ValidationItem&gt; GetItems(string name) { var Validation = new ObservableCollection&lt;ValidationItem&gt;(); var item = new ValidationItem(); item.item = "Customer"; var subItem = new ValidationItem(); subItem.item = "Name"; item.SubItems.Add(subItem); var Message = new ValidationItem(); Message.item = new ObservableCollection&lt;ValidationMessages&gt;().ToString(); subItem.SubItems.Add(Message); Validation.Add(item); return Validation; } } } </code></pre> <p>VALIDATIONMESSAGES CLASS(Needs to be implemented into the Validation Item Class)</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections.ObjectModel; namespace ValidationWPF.DataSources { public class ValidationMessages { public ValidationMessages(string Message) { this.Message = Message; } public string Message { get; set; } } } </code></pre> <p>VALIDATIONUSERCONTROL XAML:</p> <pre><code>&lt;UserControl x:Class="ValidationWPF.ValidationUserControl" 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:telerik="http://schemas.telerik.com/2008/xaml/presentation" xmlns:local="clr-namespace:ValidationWPF.DataSources" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300"&gt; &lt;UserControl.Resources&gt; &lt;/UserControl.Resources&gt; &lt;Grid x:Name="LayoutRoot" Background="White"&gt; &lt;telerik:RadTreeView x:Name="radTreeView" Margin="8"&gt; &lt;telerik:RadTreeView.ItemTemplate&gt; &lt;HierarchicalDataTemplate ItemsSource="{Binding SubItems}"&gt; &lt;TextBlock Text="{Binding item}" /&gt; &lt;/HierarchicalDataTemplate&gt; &lt;/telerik:RadTreeView.ItemTemplate&gt; &lt;/telerik:RadTreeView&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>OUTPUT:</p> <pre><code>Customer Name Message Below* *System.Collections.ObjectModel.ObservableCollection'1[ValidationWPF.DataSources.ValidationMessages] </code></pre>
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