React `context` always empty object
<p>I'm trying to set a context in my React App, but somehow i can't acces <code>context</code> from childrens.
This is the parent class:</p>

<pre><code>import React from 'react'
import MenuBar from './MenuBar.js'

export default class App extends React.Component {

  static childContextTypes = {
    prop:    React.PropTypes.bool
  };

  getChildContext(){
    return {
      prop: true
    }
  }

  render() {
    return (
      &lt;div&gt;
        &lt;MenuBar /&gt;
      &lt;/div&gt;  
    )
  }

}
</code></pre>

<p>And here is my children class:</p>

<pre><code>import React, { Component } from 'react';

export default class MenuBar extends Component {

  constructor(props, context){
    super(props,context)
    console.log(this.context)
    console.log(context)
  }

  render() {
    console.log(this.context)
    return (
      &lt;div&gt;MenuBar&lt;/div&gt;
    );
  }
}
</code></pre>

<p>All the <code>console.log</code>'s return an empty object, what am i doing wrong?</p>