my-element2.html

<link rel="import" href="bower_components/polymer/polymer-element.html">
<link rel="import" href="bower_components/paper-input/paper-input.html">
<script src="/Bindable.js"></script>

<dom-module id="my-element2">
	<template>
		<paper-input value="{{msg}}"></paper-input>
		<div>{{msg}}</div>
		<paper-input value="{{prop.test}}"></paper-input>
		<div>{{prop.test}}</div>
	</template>
	<script>
		
		class MyElement2 extends Bindable(Polymer.Element) {
			static get is() {
				return 'my-element2';
			}
			static get properties() {
				return {
					msg : {
						type: String,
						value : "Dynamic object property",
						notify : true
					},
					prop : {
						type : Object,
						value : {
							test : "Dynamic object sub-property"
						},
						notify : true
					}
				}
			}
		}
		
		customElements.define(MyElement2.is, MyElement2);
	</script>
</dom-module>