title: Enable specific days of DatePicker
body: <p>I'm setting up a website using Office Fabric UI but didn't found a way to enable specific days from the DatePicker component (and disable all the others).</p>
  
  <p>My stack consists of Nodejs and React, thus I'm using the <code>office-ui-fabric-react</code> package. This is what I have:</p>
  
  <pre><code>&lt;DatePicker
    isRequired={true}
    ariaLabel={"This field is required."}
    value={this.state.startDate}
    firstDayOfWeek={DayOfWeek.Monday}
    onSelectDate={this.handleDateChange}
  /&gt;
  </code></pre>
  
  <p>I think this can be achieve with pickadate.js this way:</p>
  
  <pre><code>picker.set('disable', true); // Disable all
  picker.set('enable', enableDates); // Enable some
  </code></pre>
  
  <p>But I can't really understand how to connect that script with the React component... any ideas? Am I missing something?</p>
  
  <p>Thank you!</p>
  
  <p>P.S.: I know that the Calendar component implements a <code>restrictedDates</code> attribute to disable an array of dates. But I'm trying to do the opposite (disable everything and enable some) using the DatePicker.</p>