title: React multiple contexts
body: <p>I am using functions which are passed down through context.</p>
  
  <pre><code>ChildComponent.contextType = SomeContext;
  </code></pre>
  
  <p>Now I use <code>this.context.someFunction();</code>. This works.</p>
  
  <p>How can I do this if I need functions from two different parent components?</p>