How to add a context menu by pressing a RadButton?

        RadContextMenu radContextmenu = new RadContextMenu();

        public RadForm1()
        {
            InitializeComponent();

            RadMenuItem menuItem1 = new RadMenuItem();
            menuItem1.Text = "Show";
            radContextmenu.Items.Add(menuItem1);
            RadMenuItem menuItem2 = new RadMenuItem();
            menuItem2.Text = "Hide";
            radContextmenu.Items.Add(menuItem2);
        }

        private void radButton1_Click(object sender, EventArgs e)
        {
            var args = e as MouseEventArgs; 

            radContextmenu.Show(this.radButton1, new Point(args.Location.X - radContextmenu.DropDown.Width, args.Location.Y));
        }

        private void RadForm1_Load(object sender, EventArgs e)
        {
            radContextmenu.DropDown.LoadElementTree();
        }