title: How to keep primefaces rowexpansion open?
body: <p>I have a nested datatable with row expension so far so god, but I want to keep all rows expanded (open) how to achieve this on primefaces?</p>
  
  <p>thanks in advance.</p>
  
  <p>Sorry, I didn't tell what version of primefaces am I using, version 3.5.</p>