title: show stack trace in yii framework
body: <p>we get stack trace when an error occurs in the execution, like in the following picture .</p>
  
  <p><a href="http://i.stack.imgur.com/4f9Mq.gif" rel="noreferrer">see this</a> </p>
  
  <p>I would like to see this tracing at the bottom of the page every time I executes a page. ( even without errors) so that I can find out what are the pages ran and what is happening inside the framework</p>
  
  <p>How can I activate this ?</p>
  
  <p>Thank you very much</p>