title: Wordpress widget how to only display sub-categories based on selected Parent Category?
body: <p>I was wondering if anybody know hows to modify the existing category widget to only display the categories within the selected parent category.
  Example:</p>
  
  <p>If my categories are structured like:</p>
  
  <ul>
  <li>Computers<br>
  <ul>
  <li>Laptops</li>
  <li>Desktops</li>
  <li>Software</li>
  </ul></li>
  <li>Electronics
  <ul>
  <li>Cameras</li>
  <li>Audio/Video</li>
  </ul></li>
  </ul>
  
  <p>If somebody is viewing posts in the Computers category I would like the categories widget in the side bar to only display Laptops, Desktops &amp; Software..</p>
  
  <p>Is there a way to get this done? Is anybody familiar of a plugin that maybe do that?
  Thanks!</p>