anchor.diff:  
   var ParrentComponent = react.registerComponent(() => new _ParrentComponent());
   class _ParrentComponent extends react.Component {
  +  // String refs
     showInputValue(_) {
       var input = react.findDOMNode(ref('inputRef')) as InputElement;
       print(input.value);
  
positive.code:   incrementChildValue(_) {
      ref("childRef").incrementValue();
    }
    render() =>
      react.div({},[
        react.input({"ref": "inputRef"}),
        react.button({"onClick": showInputValue}, "print input element value"),
        ChildComponent({"ref": "childRef"}),
        react.button({"onClick": showChildValue}, "Show child value"),
        react.button({"onClick": incrementChildValue}, "Show child value"),
  
      ]);
  }
  
  
negative.code:   setClientConfiguration();
    var component = ParrentComponent({});
    react.render(component, mountedNode);
  }
  