title: this.refs is an empty object, although it should be set
body: <p>I have a react component which is rendering a t-comb-form. The form seems to render alright.</p>
  
  <pre><code>return (
    &lt;form className="modal-body-form"
                autoCorrect="off"
                autoCapitalize="none"
                autoComplete="off"
                formMethod="post"
                onSubmit={function(e) {e.preventDefault();}}
              &gt;
       &lt;Form ref="form"
                  onChange={this.onFormChange}
                  type={eventSchema.struct}
                  value={this.state.rawItem}
                  options={eventSchema.options}/&gt;
    &lt;/form&gt;
  );
  </code></pre>
  
  <p>But in the method "onFormChange" I want to call <code>this.refs.form.getValue()</code> which is usually working. But this time this.refs is an empty object. Any idea why it is empty?</p>
  
  <pre><code>onFormChange: function (rawValue) {
      var modified = false;
  
      modified = isDataEqual(this.state.itemStoreState.selectedItem || {}, rawValue) === false;
  
      this.setState({
        rawItem: rawValue,
        modified: modified
      });
  
      this.refs.form.getValue(); // will automatically trigger the form validation 
  }
  </code></pre>
  
  <p>as an info. I am using react 0.13.3 with the old createClass syntax. So the this should be correctly bound</p>