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    copied!<p>I realise this has already had an answer accepted, but I put this together to solve the problem. It uses a similar idea to Delta's solution, but without the need to subclass the TreeView:</p> <pre><code>public class BindableSelectedItemBehavior : Behavior&lt;TreeView&gt; { #region SelectedItem Property public object SelectedItem { get { return (object)GetValue(SelectedItemProperty); } set { SetValue(SelectedItemProperty, value); } } public static readonly DependencyProperty SelectedItemProperty = DependencyProperty.Register("SelectedItem", typeof(object), typeof(BindableSelectedItemBehavior), new UIPropertyMetadata(null, OnSelectedItemChanged)); private static void OnSelectedItemChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { var item = e.NewValue as TreeViewItem; if (item != null) { item.SetValue(TreeViewItem.IsSelectedProperty, true); } } #endregion protected override void OnAttached() { base.OnAttached(); this.AssociatedObject.SelectedItemChanged += OnTreeViewSelectedItemChanged; } protected override void OnDetaching() { base.OnDetaching(); if (this.AssociatedObject != null) { this.AssociatedObject.SelectedItemChanged -= OnTreeViewSelectedItemChanged; } } private void OnTreeViewSelectedItemChanged(object sender, RoutedPropertyChangedEventArgs&lt;object&gt; e) { this.SelectedItem = e.NewValue; } } </code></pre> <p>You can then use this in your XAML as:</p> <pre><code>&lt;TreeView&gt; &lt;e:Interaction.Behaviors&gt; &lt;behaviours:BindableSelectedItemBehavior SelectedItem="{Binding SelectedItem, Mode=TwoWay}" /&gt; &lt;/e:Interaction.Behaviors&gt; &lt;/TreeView&gt; </code></pre> <p>Hopefully it will help someone!</p>
 

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