title: React material-ui MenuItem containerElement not working
body: <p>I have following code:</p>
  
  <pre><code>&lt;MenuItem primaryText="home" containerElement={&lt;Link to="/" /&gt;} /&gt;
  </code></pre>
  
  <p>But it doesn't work as explained in other topics/threads where MenuItem discussed like here <a href="https://stackoverflow.com/questions/32106513/material-ui-menu-using-routes">Material UI Menu using routes</a>.
  Once i add containerElement prop to MenuItem i'm getting this exception:</p>
  
  <pre><code>Uncaught Error: 
  Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. 
  You likely forgot to export your component from the file it's defined in.
  Check the render method of `EnhancedButton`.
  </code></pre>