title: Dart passing data to a dynamically created polymer element
body: <p>I have read this thread about how to pass data to a polymer element 
  <a href="https://stackoverflow.com/questions/18553448/button-click-in-polymer-dart-does-not-work-needs-polymer-element">Button click in polymer dart does not work; needs polymer-element</a></p>
  
  <p>But however, if I want to pass data to a programmatically created element by using createElement() in polymer.dart, there's no wrapping template. How am I going to pass the data as mentioned above?</p>
  
  <p>Btw, even though I think dart is a really cool language (I dislike JavaScript,) I found polymer in dart maybe still not ready yet. A lot of things are not documented and have to go though examples or ask here.</p>
  
  <p>Thanks,
  Yi</p>