title: How to create the vertical menu and make the submenu on the menu's right side in WPF?
body: <p><a href="https://i.stack.imgur.com/IuBuM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IuBuM.png" alt="enter image description here" /></a></p>
  <p>As the picture show, how can I create the menu like that in WPF?</p>
  <p>I've tried that by using Popup control and Menus control, but the effect is not ideal</p>