title: Handle Change of FormControl React
body: <p>Hey so I have a text box/FormControl that's supposed to update a field in a json in this.state. I was wondering if there was a better way to do onChange?</p>
  
  <pre><code>&lt;FormControl 
    type='text' 
    placeholder='enter' 
    defaultValue={this.state.form.name}
    onChange={this.handleChange.bind(this, 'name')}
  /&gt;
  &lt;/FormGroup&gt;
  </code></pre>
  
  <p>`</p>
  
  <pre><code>handleChange(change, event) {
      var toChange = this.state.form;
      toChange[change] = event.target.value;
      this.setState({form: toChange});
    }
  </code></pre>