title: Add a conf menu to my portlet
body: <p>I'm trying to add a tab in the conf of my custom portlet, beside the natives import/export and permissions.</p>
  
  <p>Like in this image : <a href="http://imageshack.us/photo/my-images/716/sampledn.png/" rel="nofollow">http://imageshack.us/photo/my-images/716/sampledn.png/</a></p>
  
  <p>This tab had to allow, to change the value of a parameter in a conf.properties which define some variable.</p>
  
  <p>How can I do that?</p>
  
  <p>Regards.</p>