How to hide system tray menu mouse is clicked on Desktop?

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WPF

created an application, where i'm creating a system tray icon. If i right click on the system tray, tehn i'm opening a menu. If i click on dektop , then i want to close the menu. Please let me know how to do it? below is my code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.Drawing;
using System.Resources;

namespace Systrayicon
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class RegistrationWindow : Window
    {
        private System.Windows.Forms.NotifyIcon _notifyIcon = null;
        private System.Windows.Controls.ContextMenu _mContextMenu;

        
        public RegistrationWindow()
        {
            InitializeComponent();

            _mContextMenu = new System.Windows.Controls.ContextMenu();

            if (null == _notifyIcon)
            {
                _notifyIcon = new System.Windows.Forms.NotifyIcon
                {
                    Icon = new Icon(@"D:\WPFSystemTray\Images\RedOrb.ico"),
                    Visible = true
                };

                _notifyIcon.MouseUp += new System.Windows.Forms.MouseEventHandler(NotifyIconMouseUp);
            }
        }

        private void Window_Closed(object sender, EventArgs e)
        {
            this._notifyIcon.Dispose();
        }


        void NotifyIconMouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            bool CreateTrayMenu = false;

          
                CreateTrayMenu = true;

            // Check if any modal dialog is visible or not
            //if (true == CreateTrayMenu)
            {
                if (e.Button == System.Windows.Forms.MouseButtons.Right)
                {
                    
                    MenuItem menuShow = new MenuItem();
                    menuShow.Header = "ShowAppClick";
                   // menuShow.Click += new RoutedEventHandler(ShowAppClick);


                    MenuItem menuCloseApplication = new MenuItem();
                    menuCloseApplication.Header = "CloseAppClick";
                    //menuCloseApplication.Click += new RoutedEventHandler(CloseAppClick);

                    _mContextMenu.Items.Add(menuShow);
                    _mContextMenu.Items.Add(menuCloseApplication);

                    _mContextMenu.IsOpen = true;

                    _mContextMenu.IsKeyboardFocusWithinChanged += new DependencyPropertyChangedEventHandler(_mContextMenu_IsEnabledChanged);

                    _mContextMenu.LostFocus += new RoutedEventHandler(_mContextMenu_LostFocus);
                }
            }
        }

        void _mContextMenu_LostFocus(object sender, RoutedEventArgs e)
        {
            //throw new NotImplementedException();
            _mContextMenu.IsOpen = false;
        }

        protected override void OnStateChanged(EventArgs e)
        {
            int j = 0;
            ++j;
        }
        void _mContextMenu_IsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            //throw new NotImplementedException();
            _mContextMenu.IsOpen = false;
        }
        //protected override void Dispose(bool disposing)
        //{
        //    if (disposing)
        //    {
        //        this._notifyIcon.Dispose();
        //    }
        //}
    }
}

Thank you all.