title: Resetting the selected values in Google visualization category picker control
body: <p>Here is a <a href="http://jsfiddle.net/HtWj8/1/" rel="nofollow">sample fiddle</a> in which there is Google visualization category picker control. I am trying to reset the selected values of category picker as,</p>
  
  <pre><code>function dashboardReady() {
        // reset the category picker when clicked.
      document.getElementById('resetButton').onclick = function() {
        categoryPicker.setState({'categoryPicker.getState().selectedValues' : 'none'});
        categoryPicker.draw();
      };
    }
  </code></pre>
  
  <p>using a button <code>&lt;button style="margin: 2em" id="resetButton"&gt;Reset&lt;/button&gt;</code>. 
  How to reset it correctly?</p>