title: How to find an element inside another element in mootools
body: <p>Let's say i need to find all <code>.bar</code> elements inside an element that's assigned to a variable <code>foo</code>.</p>
  
  <p>In jQuery, <code>foo.find('.bar')</code> solves the problem.</p>
  
  <p>What's the equivalent function in mooTools?</p>