title: Select all checkbox redux form
body: <p>I want to check/ uncheck all checkboxes the moment I select Check All but can't make it work. I'm using material-ui components and redux-form. my plan is to grab checkAll field value using formValueSelector API and set checkbox A and B value based of that. Also tried using value prop but no luck still.</p>
  
  <pre><code>import React from 'react';
  import { connect } from 'react-redux';
  import { Field, reduxForm, formValueSelector } from 'redux-form';
  import { Checkbox } from 'redux-form-material-ui';
  
  let Form = (props) =&gt; {
  
  return (
      &lt;form&gt;
  
        &lt;Field name="checkAll" id="checkAll" label="Check All" component={ Checkbox } /&gt;
  
        &lt;Field name="a" label="A" component={ Checkbox } checked={ props.checkAll } /&gt;
  
        &lt;Field name="b" label="B" component={ Checkbox } checked={ props.checkAll } /&gt;
  
      &lt;/form&gt;
    );
  };
  
  Form = reduxForm({
    form: 'Form'
  })(AddReturnModal);
  
  // Decorate with connect to read form values
  const selector = formValueSelector('Form'); // &lt;-- same as form name
  Form = connect(
   (state) =&gt; {
      const checkAll = selector(state, 'checkAll');
  
      return {
        checkAll
      };
    }
  )(Form);
  
  export default Form;
  </code></pre>