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    copied!<p>You could define a <code>DependencyProperty</code>. Below I have shared a sample app which uses a dependency property to achieve this. </p> <p>TreeViewExtension.cs</p> <pre><code>using System.Windows; using System.Windows.Controls; using System.Windows.Input; using System.Windows.Media; namespace WpfApplication1 { public static class TreeViewExtension { public static readonly DependencyProperty SelectItemOnRightClickProperty = DependencyProperty.RegisterAttached( "SelectItemOnRightClick", typeof(bool), typeof(TreeViewExtension), new UIPropertyMetadata(false, OnSelectItemOnRightClickChanged)); public static bool GetSelectItemOnRightClick(DependencyObject d) { return (bool)d.GetValue(SelectItemOnRightClickProperty); } public static void SetSelectItemOnRightClick(DependencyObject d, bool value) { d.SetValue(SelectItemOnRightClickProperty, value); } private static void OnSelectItemOnRightClickChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { bool selectItemOnRightClick = (bool)e.NewValue; TreeView treeView = d as TreeView; if (treeView != null) { if (selectItemOnRightClick) treeView.PreviewMouseRightButtonDown += OnPreviewMouseRightButtonDown; else treeView.PreviewMouseRightButtonDown -= OnPreviewMouseRightButtonDown; } } private static void OnPreviewMouseRightButtonDown(object sender, MouseButtonEventArgs e) { TreeViewItem treeViewItem = VisualUpwardSearch(e.OriginalSource as DependencyObject); if (treeViewItem != null) { treeViewItem.Focus(); e.Handled = true; } } public static TreeViewItem VisualUpwardSearch(DependencyObject source) { while (source != null &amp;&amp; !(source is TreeViewItem)) source = VisualTreeHelper.GetParent(source); return source as TreeViewItem; } } } </code></pre> <p>XAML:</p> <pre><code>&lt;Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mvvmhelper="clr-namespace:WpfApplication1" Title="MainWindow" Height="350" Width="525"&gt; &lt;Grid&gt; &lt;TreeView mvvmhelper:TreeViewExtension.SelectItemOnRightClick="true"&gt; &lt;TreeViewItem Header="One"/&gt; &lt;TreeViewItem Header="Two"/&gt; &lt;TreeViewItem Header="Three"/&gt; &lt;TreeView.ContextMenu&gt; &lt;ContextMenu&gt; &lt;MenuItem Header="Menu1"/&gt; &lt;MenuItem Header="Menu2"/&gt; &lt;/ContextMenu&gt; &lt;/TreeView.ContextMenu&gt; &lt;/TreeView&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre>
 

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