Polymer With Ember CLI

I am trying to access a paper-button inside a polymer component which is in a handlebars template in EMBER.

This is the Polymer component

    <link href="../polymer/polymer.html" rel="import">
<link rel="import" href="../paper-button/paper-button.html">
<polymer-element name="my-new" noscript>
  <template>
    <paper-input></paper-input>
    <paper-button>BUTTON1</paper-button>
  </template>
</polymer-element>

This is my application.hbs

<my-new></my-new>

How to handle click event of the paper-button in the controllers.