Formsets by Ref

In your documentation, you show managing the formsets by storing the constructed form in the state.

http://newforms.readthedocs.io/en/latest/formsets.html?highlight=formset

```
var ArticleFormSet = forms.FormSet.extend({form: Article})
var BookFormSet = forms.FormSet.extend({form: Book})

var PublicationManager = React.createClass({
getInitialState: function() {
return {
articleFormset: new ArticleFormSet({prefix: 'articles'})
, bookFormset: new BookFormSet({prefix: 'books'})
}
},

// ...rendering implemented as normal...

onSubmit: function(e) {
e.preventDefault()
var articlesValid = this.state.articleFormset.validate()
var booksValid = this.state.bookFormset.validate()
if (articlesValid && booksValid) {
// Do something with cleanedData() on the formsets
}
}
})
```

Is there a way we can do it via ref so we can reference the formset later and just allow the formset to render when the props update?