title: get clicked button's name
body: <p>I have the following button with event attached:</p>
  
  <pre><code>&lt;button className="pull-right btn btn-success" onClick={this.onNextStep}&gt;Next&lt;/button&gt;
  </code></pre>
  
  <p>OnNextStep:</p>
  
  <pre><code>onNextStep: function (e) {
      ...
  }
  </code></pre>
  
  <p>How do I get the button name inside onNextStep?</p>
  
  <p>e.target.value is not working</p>
  
  <p>And how do I change it?</p>