title: Polymer accessing created components
body: <p>I have tried (guessed) many possible options and searched but I cannot find how to check the created checkboxes when a button is pressed. I know I need to read more and I won't give up but I do want to move on quickly if anyone can help, I want to get to the next part of the app.
  Thanks</p>
  
  <pre><code>&lt;div id="divc"&gt;
      &lt;core-selector target="{{$.myForm}}" itemsSelector="input[type=checkbox]" 
          selected="{{Index}}" valueattr="value" activateEvent="change"&gt;
      &lt;/core-selector&gt;
  
      &lt;form id="myForm"&gt;
  
      &lt;template repeat="{{cItem, Index in carray}}"&gt; 
          &lt;label&gt;&lt;input name="{{Index}}" type="checkbox" value="{{Index}}"&gt;            {{cItem._Ffield}}&lt;/label&gt; &lt;br&gt; 
      &lt;/template&gt; 
  
      &lt;/form&gt;
  
   &lt;/div&gt;
  </code></pre>
  
  <p>In the script I can move to the next checkbox when the button is pressed</p>
  
  <pre><code>&lt;script&gt;
  
  Polymer('my-element', {
      created: function()
      {
          this.Index = 0;
      },
      increment: function(e){
          //would like to check the checkbox before moving to the next, I thought it would be easy but nothing seems to work.
  
          this.Index++;  //move to next
      }
  
  });
  
  &lt;/script&gt;
  </code></pre>