wpf中的路由隧道事件

我有一个问题要问wpf社区。我有点不能理解路由隧道事件。在我的应用程序中，我有一个包含工具栏的窗口。窗口也包含用户控件。在工具栏中有一些控件，如视图，用于隐藏/取消隐藏用户控件(视图)，就像在Visual Studio中一样。

我有自定义路由隧道事件在窗口控制。当单击工具栏上的按钮(隐藏/取消隐藏)时，我会引发自定义事件。当按钮被点击时，我需要隐藏一个扩展器在子用户控制(它有一个像"expander 1"的名字)。

有人能告诉我如何在子用户控件中捕获引发事件吗?

谢谢。

代码窗口:

public partial class MainWindow : Window
    {
        private static readonly RoutedEvent HideShowMitigationEvent;
        static MainWindow()
            {
            HideShowMitigationEvent = EventManager.RegisterRoutedEvent("HideShowMitigation",
                RoutingStrategy.Tunnel, typeof(RoutedEventHandler), typeof(MainWindow));
            }
        public MainWindow()
            {
            InitializeComponent();
            }
        // The Standard .Net optional event wrapper
        // This is required if we want to register the event handler in XAML       
        public event RoutedEventHandler HideShowMitigation
            {
            add { AddHandler(HideShowMitigationEvent, value); }
            remove { RemoveHandler(HideShowMitigationEvent, value); }
            }
        // Raise the event. overidden from UIElement       
        protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
            {
           // RaiseEvent(new RoutedEventArgs(HideShowMitigationEvent, this));
            }

        public static ExploredRisks _rootName { get; set; }
        public MainWindow(GeneralTree<string> rawTreeData, Excel.Worksheet sheet,Excel.Workbook Wb)
        {
            //prepares the visual tree for other views
            PrepareVisualTree visualTree = new PrepareVisualTree(rawTreeData, sheet);
            _rootName = visualTree.getVisualTree();
            var l_vm = new MainViewModel();
            l_vm.Load(_rootName);
           TreeListViewMultiColumned view = new TreeListViewMultiColumned( RiskViewModel.CreateTestModel(visualTree.getVisualTree()),sheet,Wb);

            base.DataContext = l_vm;
            InitializeComponent();
        }
        private void UIPanel_Loaded(object sender, RoutedEventArgs e)
        {
        }

        private void RibbonCheckBox_Checked(object sender, RoutedEventArgs e)
        {
           RaiseEvent(new RoutedEventArgs(HideShowMitigationEvent, this));
        }
        private void SimpleClickEventHandlingCode(object sender, RoutedEventArgs e)
            {
            //Expander exp = ((MainWindow)(e.OriginalSource)).RiskProperties.MitigationArea; 
                RoutedEventArgs args = new RoutedEventArgs();
                args.RoutedEvent = HideShowMitigationEvent;
                 RaiseEvent(args);
            }
    }
}

窗口Xaml:

<Window>

       <Ribbon x:Name="RibbonWin"  SelectedIndex="0">
             <RibbonTab Header="Views" KeyTip="H">
                <!-- Home  group-->
                <RibbonGroup x:Name="ViewsGroup" Header="Views">
                    <RibbonCheckBox Label="Mitigation" IsChecked="{Binding IsChecked, Mode=TwoWay}" Checked="RibbonCheckBox_Checked" PreviewMouseDown="SimpleClickEventHandlingCode"/>
                    <RibbonCheckBox Label="Properties" IsChecked="{Binding IsChecked, Mode=TwoWay}" Checked="RibbonCheckBox_Checked" />
                </RibbonGroup>
            </RibbonTab>
        </Ribbon>
  <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>
            <UI:TreeListViewMultiColumned x:Name="RiskProperties"  Grid.Column="0"  />
        </Grid>
</Window>