title: Polymer function call with parameters
body: <p>This seems like a very simple one, but somehow I am not sure how to do it.
  I want to send data to a Polymer component with the "core-collapse-open" event but this is not working:</p>
  
  <pre><code>&lt;core-collapse on-core-collapse-open="{{loadDetails(data)}}"&gt;
  {{data.Title}}
  ...
  </code></pre>
  
  <p>When I use the above code, the <code>loadDetails</code> function in polymer is not hitting.</p>
  
  <pre><code>Polymer('custom-item', {
          data: {},
          ready: function () {
          },   
          loadDetails: function (e, details, sender) {
              debugger;
          }
      });
  </code></pre>
  
  <p>If I am not using the function syntax in the declarative syntax(as below), the loadDetails function hits.</p>
  
  <pre><code>&lt;core-collapse on-core-collapse-open="{{loadDetails}}"&gt;
  {{data.Title}}
  ...
  </code></pre>
  
  <p>How can I send parameters in events.</p>