title: How to get the styles that will be applied for a given class list in ExtJs
body: <p>I've tried <code>Ext.DomHelper.createDom</code> but it creates an object without applying the <code>document styles</code> to it. The <code>Ext.util.CSS.getRules</code> can get all the rules, but I'd have to manually figure out which styles will be overridden and which'll be applied. </p>
  
  <p>Is there an easy way to get the styles given a class list?</p>