title: Disable dates in Kendo Calendar after the initialization
body: <p>I have simple Kendo calendar, where I can disable dates at the moment of its initialization:</p>
  
  <pre><code>$("#simpleCalendar").kendoCalendar({
      disableDates: ["sa", "su"]
  });
  </code></pre>
  
  <p>How could I disable specified dates, after the initialization of this calendar?</p>