() => {
  class MyForm extends Component {
    constructor() {
      super();

      this.focus = this.focus.bind(this);
    }

    focus() {
      this.input.focus();
    }

    render() {
      return (
        <DemoLayout>
          <Radio
            label="Option 1"
            value="1"
            inputRef={ref => { this.input = ref; }} />
          <Button onClick={ this.focus }>Focus the input</Button>
        </DemoLayout>
      )
    }
  }

  return <MyForm />;
}