title: React how to update another component's state?
body: <p>I am pretty new to react, trying to make some components work. I have</p>
  
  <pre><code>    ObjectA:React.createClass({
          propTypes: {
             ...
  
          },
  
          getInitialState: function() {
              return {
                  myState: null
              }
          },
  
          updateMyState: function(value) {
             this.setState({
                 myState: value
             })
          }
  
          render: function() {
              return (&lt;div className="my-class"&gt;'hello' +{this.state.myState}&lt;/div&gt;);
            }
      });
  
      ObjectB:React.createClass({
              propTypes: {
                 ...
  
              },
  
              render: function() {
                  return (&lt;div className="my-class"&gt;&lt;ObjectA / &gt;
  
              &lt;/div&gt;);
              }
          });
  </code></pre>
  
  <p>I'd like to update ObjectA's state from ObjectB. How could I in ObjectB call ObjectA's updateMyState method?
  Thanks!</p>