radial buttons incomplete

gistfile1.html

<link rel="import" href="bower_components/polymer/polymer.html"        >
<link rel="import" href="../paper-radio-group/paper-radio-group.html"  >
<link rel="import" href="../paper-radio-button/paper-radio-button.html">

<polymer-element name="x-radial-buttons">
    <!-- Shadow DOM -->
    <template>
        <style>
            #paper_radio_group {
                position: relative;
                width:    440px;
                height:   50px;
            }
        </style>
        <paper-radio-group selected="English-GB" valueattr="label" selectedindex="1" id="paper_radio_group">
            <paper-radio-button label="English-US" id="paper_radio_btn_en-US" on-click="{{ changeAccentUS }}"></paper-radio-button>
            <paper-radio-button label="English-GB" id="paper_radio_btn_en-GB" on-click="{{ changeAccentGB }}"></paper-radio-button>
            <paper-radio-button label="Spanish"	   id="paper_radio_btn_es-ES" on-click="{{ changeAccentES }}"></paper-radio-button>
        </paper-radio-group>
    </template> <!-- /Shadow DOM -->

    <script>
 	Polymer({
 	})
    </script>
</polymer-element>