title: Event.ADDED_TO_STAGE does not get fired for DisplayObjects added to a ScrollContainer
body: <p>I'm using Starling + Feathers + StarlingMVC to build a small game.</p>
  
  <p>Doing that, I'm having an issue with ScrollContainer : it seems like elements (Buttons in my case) added to a ScrollContainer do not fire the Event.ADDED event and as a result do not get themed.</p>
  
  <p>Here is a pastebin containing <a href="http://pastebin.com/0mSh8NQG" rel="nofollow">the adding code</a> : _shopButton as well as _shopRPButton are visible when I test my game because I specify their textures, but _startButton is not, because it should get themed.</p>
  
  <p>Here is my <a href="http://pastebin.com/BhTqrVFM" rel="nofollow">custom theme's code</a>, which contains a trace() statement inside buttonInitializer</p>
  
  <p>And here is the related tracelog (I would have put a pastebin link but my reputation isn't high enough to post more than two links</p>
  
  <blockquote>
    <p>feathers-header-item
    feathers-header-item
    feathers-simple-scroll-bar-thumb
    feathers-simple-scroll-bar-thumb
    feathers-simple-scroll-bar-thumb
    feathers-simple-scroll-bar-thumb
    feathers-simple-scroll-bar-thumb
    feathers-simple-scroll-bar-thumb</p>
  </blockquote>
  
  <p>As you can see, the trace() statement gets called for ScrollContainer related items, but not for my buttons.</p>
  
  <p>What am I doing wrong?</p>
  
  <p>Regards,
  Brice</p>