Heya! Still somewhat new to Polymer so I'm pretty sure I'm doing something 
wrong with binding, templating, models, etc.  But here's what I'd like to 
do in a nutshell... given a template within another template, I'd like to 
be able to access elements that are added after initialization by ID.  In 
other words, given this:

<template>
  <template repeat="{{a in myList}}">
    <span id="element{{a}}">Span {{a}}</span>
  </template>
</template>

myList: [1]

I see a span tag with ID element1 and can access it just like I expect to 
with *this.$.element1*. However, when I dynamically add subsequent elements 
to myList (e.g. this.myList.push(2)), I can't seem to access them; 
*this.$.element1* is still mapped correctly, but *this.$.element2* is 
nowhere to be found.  

I've put together a fiddle <http://jsfiddle.net/2f41ccjg/> that describes 
the problem.  Click Add Elements to add elements to the list, the click 
Test Results and check the console for my thought process.

Is there something additional I need to do to the model to get similar 
access to *this.$.element2*?  I can access it through* 
this.shadowRoot.querySelector('#element2')*, but I'm wondering why I don't 
need to do that for *element1*.  Thanks!

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