title: Limiting a Tkx::tk___chooseDirectory() search to specific directories
body: <p>I have a Perl script that uses <code>Tkx::tk___chooseDirectory()</code> to allow the user to select a directory.</p>
  
  <p>The problem is only a few specific directories are valid for the actions that the script is going to perform.  Is there a way to limit the folders displayed by this function to show only folders below a specific subdirectory?</p>
  
  <hr>
  
  <p>Example:</p>
  
  <p><img src="https://i.stack.imgur.com/VXurk.png" alt="Directory listing"></p>
  
  <p>Say I wanted to only give the user the option to select "Perl64" or any of its subdirectories.  How can I force it to hide the other folders (like "PerfLogs" or "Program Files") and only display the valid folders.</p>
  
  <p>I know I can use the <code>-initialdir</code> option to make it start on "Perl64", but that doesn't hide the other choices.</p>