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copied!<p>This may not be what you're looking for, but you could write an extension for the <code>MenuItem</code> class that allows you to use something like the <code>GroupName</code> property of the <code>RadioButton</code> class. I slightly modified <a href="http://www.bradcunningham.net/2009/09/grouping-and-checkboxes-in-wpf.html" rel="noreferrer">this</a> handy example for similarly extending <code>ToggleButton</code> controls and reworked it a little for your situation and came up with this:</p> <pre><code>using System; using System.Collections.Generic; using System.Windows; using System.Windows.Controls; using System.Windows.Controls.Primitives; namespace WpfTest { public class MenuItemExtensions : DependencyObject { public static Dictionary<MenuItem, String> ElementToGroupNames = new Dictionary<MenuItem, String>(); public static readonly DependencyProperty GroupNameProperty = DependencyProperty.RegisterAttached("GroupName", typeof(String), typeof(MenuItemExtensions), new PropertyMetadata(String.Empty, OnGroupNameChanged)); public static void SetGroupName(MenuItem element, String value) { element.SetValue(GroupNameProperty, value); } public static String GetGroupName(MenuItem element) { return element.GetValue(GroupNameProperty).ToString(); } private static void OnGroupNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { //Add an entry to the group name collection var menuItem = d as MenuItem; if (menuItem != null) { String newGroupName = e.NewValue.ToString(); String oldGroupName = e.OldValue.ToString(); if (String.IsNullOrEmpty(newGroupName)) { //Removing the toggle button from grouping RemoveCheckboxFromGrouping(menuItem); } else { //Switching to a new group if (newGroupName != oldGroupName) { if (!String.IsNullOrEmpty(oldGroupName)) { //Remove the old group mapping RemoveCheckboxFromGrouping(menuItem); } ElementToGroupNames.Add(menuItem, e.NewValue.ToString()); menuItem.Checked += MenuItemChecked; } } } } private static void RemoveCheckboxFromGrouping(MenuItem checkBox) { ElementToGroupNames.Remove(checkBox); checkBox.Checked -= MenuItemChecked; } static void MenuItemChecked(object sender, RoutedEventArgs e) { var menuItem = e.OriginalSource as MenuItem; foreach (var item in ElementToGroupNames) { if (item.Key != menuItem && item.Value == GetGroupName(menuItem)) { item.Key.IsChecked = false; } } } } } </code></pre> <p>Then, in the XAML, you'd write:</p> <pre><code> <MenuItem x:Name="MenuItem_Root" Header="Root"> <MenuItem x:Name="MenuItem_Item1" YourNamespace:MenuItemExtensions.GroupName="someGroup" IsCheckable="True" Header="item1" /> <MenuItem x:Name="MenuItem_Item2" YourNamespace:MenuItemExtensions.GroupName="someGroup" IsCheckable="True" Header="item2"/> <MenuItem x:Name="MenuItem_Item3" YourNamespace:MenuItemExtensions.GroupName="someGroup" IsCheckable="True" Header="item3"/> </MenuItem> </code></pre> <p>It's a bit of a pain, but it offers the perk of not forcing you to write any additional procedural code (aside from the extension class, of course) to implement it.</p> <p>Credit goes to Brad Cunningham who authored the original ToggleButton solution.</p>

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