title: YUI2: How to subscribe to YUI Panel hide event?
body: <p>I am using YUI Panel <code>http://developer.yahoo.com/yui/container/panel/</code> to design an application.</p>
  <p>I want to execute some code at the time of <code>show()</code> and <code>hide()</code> of the panel.
  I don't know what event to register and how that event can be subscribed in YUI?</p>
  <p>Anyone please suggest me any tutorial or examples, so that I can solve above problem..</p>