title: How can I hide the selected item in a WPF combo box?
body: <p>I want to hide the selected item from the opened WPF combo box, basically to show instead of this:</p>
  
  <pre><code>item2
   item1
   item2
   item3
  </code></pre>
  
  <p>this:</p>
  
  <pre><code>item2
   item1
   item3
  </code></pre>
  
  <p>How can this be done?</p>