title: How to add shortcut to Xfce (ubuntustudio)?
body: <p>I went to </p>
  
  <pre><code>Settings =&gt; Setting Manager =&gt; Window Manager =&gt; Shortcuts
  </code></pre>
  
  <p>I can modify exist keyboard shortcuts, however, there's no Add option. I googled only found out that there's + (Add) button on Shortcut tab. Is there something wrong with my Xfce? or how could i add a shortcut, say open File manager, to Xfce?</p>
  
  <p>Thanks.</p>