title: check if jQuery UI tabs have been initialized (without checking for class)
body: <p>Using jQuery UI tabs - and I've written a plugin that integrates with ui tabs.
  I've got the plugin setup to initiate jQuery UI tabs if it <code>.tabs()</code> hasn't been called, but this just does a simple class check:</p>
  
  <pre><code> if(!$globalTabs.hasClass("ui-tabs")){
      $globalTabs.tabs();
   }
  </code></pre>
  
  <p>But this is problematic, because often to avoid FOUC, developers add in the UI classes to the the tabs to get a better initial render before document.ready. </p>
  
  <p>I could check for a different class, such as `ui-widget1, but wondering if there's another/better way?</p>