Text.js

// src/components/Text.js
import React, { PropTypes } from 'react';
import TextField from 'material-ui/lib/text-field';
import * as validators from '../validators';

export default React.createClass({

  //...
  
  contextTypes: {
    update: PropTypes.func.isRequired,
    values: PropTypes.object.isRequired,
    registerValidation: PropTypes.func.isRequired
  },
  
  componentWillMount() {
    this.removeValidationFromContext = this.context.registerValidation(show => 
      this.isValid(show));
  },

  componentWillUnmount() {
    this.removeValidationFromContext();
  },

//...

});