title: Qt proxy model usage example
body: <p>I am using a Qt 4's <code>QFileSystemModel</code> and <code>QTreeView</code>. I am writing a Windows Explorer like file manager, and want to make a tree more similar to  Windows', where tree consist some shortcut paths like Desktop, My Documents.
  The only thing I want is to make a tree look like this:</p>
  
  <ul>
  <li>My Computer
  
  <ul>
  <li>Desktop</li>
  <li>My Documents</li>
  <li>C:\</li>
  <li>D:\</li>
  <li>...</li>
  </ul></li>
  </ul>
  
  <p>I heard that it can be achieved with <code>QAbstractProxyModel</code>.
  Have any one used the <code>QAbstractProxyModel</code> and get it working? If yes please provide any appropriate example. Thanks in advance.</p>
  
  <p><strong>This question is the same as <a href="https://stackoverflow.com/questions/8885817/how-to-add-custom-row-in-qfilesystemmodel">How to add custom row in QFileSystemModel?</a></strong></p>