title: Bootstrap v2.3 collapse and data-parent
body: <p>i'm using Php 5.3 symfony 2 and Bootstrap v2.3</p>
  
  <p>i wanna do an accordion like this (Bootstrap 3) :</p>
  
  <p><a href="http://jsfiddle.net/jvx7oven/" rel="nofollow noreferrer">http://jsfiddle.net/jvx7oven/</a></p>
  
  <p>But i'm using Bootstrap v2.3 and the <code>#data-parent</code> attribute doesnt work..</p>
  
  <p>i wanna do a 3 level accordion and all elements closed when one of the collapsible item is shown.</p>
  
  <p><strong>Note:</strong> The data-parent attribute makes sure that all collapsible elements under the specified parent will be closed when one of the collapsible item is shown.</p>
  
  <p>Please help me , i did it with Bootstrap2 in this fiddle :</p>
  
  <p><a href="https://jsfiddle.net/umjmb33n/" rel="nofollow noreferrer">https://jsfiddle.net/umjmb33n/</a></p>
  
  <p>But the third level "MONTH" doesnt closed when one is shown..</p>