core-pages with paper-input

http://stackoverflow.com/questions/27631062/core-pages-confilct-with-paper-input-not-rendering

HTML

<link rel="import" href="http://www.polymer-project.org/0.5/components/polymer/polymer.html">
<link rel="import" href="http://www.polymer-project.org/0.5/components/paper-elements/paper-elements.html">
<link rel="import" href="http://www.polymer-project.org/0.5/components/core-elements/core-elements.html">
<polymer-element name="my-core-pages" attributes="selected" noscript>
    <template>
        <style>
            core-pages {
                width: 300px;
                height: 300px;
                border: 1px solid black;
                -webkit-user-select: none;
                border-radius: 5px;
            }
            core-pages > section {
                display: flex;
                justify-content: center;
                align-items: center;
                border-radius: inherit;
            }
        </style>
        <core-pages selected={{selected}}>
            <section id="page1">
                <paper-input value="{{origin}}" label="Origin"></paper-input>
                <div>A: {{origin}}</div>
            </section>
            <section id="page2">
                <div>2</div>
            </section>
        </core-pages>
    </template>
</polymer-element>
<my-core-pages selected="0"></my-core-pages>