<vbox>
  <tree>
    <label>Device    |Directory        |File         </label>
    <item>Hard drive |/usr/            |letter.tex    </item>
    <item>Hard drive |/etc/            |inittab       </item>
    <item>Hard drive |/etc/            |fstab         </item>
    <item>Network    |alpha:/home      |quota.user    </item>
    <item>Network    |alpha:/home      |quota.group   </item>
    <item>Network    |beta:/home/pipas |tmp           </item>
    <item>Network    |beta:/home/pipas |latexfiles    </item>
    <item>Network    |beta:/home/pipas |book          </item>
    <item>Network    |beta:/home/pipas |bin           </item>
    <item>Network    |beta:/home/pipas |documentation </item>
  </tree>
  <button ok></button>
</vbox>