title: Is there a WPF control I can use to expand/collapse panels (animated)
body: <p>I have a window that has a lot of content. I'd like to be able to separate the content using panels, and have a separator that the user can click on the toggle between each panel (with an animation that moves the separator from left to right, showing one section and hiding the other). Think of the Microsoft Office (2007) <a href="http://www.devexpress.com/Products/NET/DXperience/WhatsNew2007v2/i/navbar-collapse.png" rel="noreferrer">navigation pane</a>. Is there an easy way to accomplish this? </p>
  
  <p>Thanks!</p>