title: React material UI reset values
body: <p>I'm using material UI with react. </p>
  
  <p>I can't seem to be able to reset a form on submit without getting errors in the console. </p>
  
  <p>If I have: <code>&lt;TextField defaultValue={myComment.title} refs="title" /&gt;</code></p>
  
  <p>On Submit, if I do this: <code>this.refs.title.setValue('')</code> I get the following error in the console </p>
  
  <blockquote>
    <p>Warning: setValue() method is deprecated. Use the defaultValue property instead.
          Or use the TextField as a controlled component with the value property.</p>
  </blockquote>
  
  <p>So I tried to do: <code>this.refs.title.defaultValue = ''</code> but that didn't work. </p>
  
  <p>I'm thinking I have to do a handleChange event? But seems very painful to set this up when all I want to do is clear the input field. </p>
  
  <p>Thanks in advance for you help. </p>