title: WPF TabControl with 'new tab' button?
body: <p>I have a <code>TabControl</code> in a WPF app, and I want to add a 'new tab' command to the tab strip (like tabbed web browsers have).</p>
  
  <p>I've had a look at the template in Blend for the <code>TabControl</code>, but I can't figure out how best to add my new button to the right of the last tab. What's the best way of doing this?</p>