怎样动态生成一个button后再在他的属性上添加一个ContextMenu控件

怎样动态生成一个button后再在他的属性上添加一个ContextMenu控件
Button btn = new Button();

假设Button的父容器对象是grid,
那么grid.Children.Add(btn);

然后设置菜单
ContextMenu menu = new ContextMenu();

            MenuItem menuItem1 = new MenuItem();
            menuItem1.Header = "This is Menu Item 1";
            menuItem1.Click += new RoutedEventHandler(MenuItem_Click);
            menu.Items.Add(menuItem1);
            MenuItem menuItem2 = new MenuItem();
            menuItem2.Header = "This is Menu Item 2";
            menuItem2.Click += new RoutedEventHandler(MenuItem_Click);
            menu.Items.Add(menuItem2);

            ContextMenuService.SetContextMenu(btn , menu);