title: how to get active group in Fabricjs
body: <p>any way in fabrics to get active Group, i tried below code but it is not working ?</p>
  
  <pre><code> $('.radius, .spacing, .align, .fontSize').change(function() {  
      var act = canvas.getActiveGroup();
          act.set($(this).attr('class'), $(this).val());  });
  
  });
  </code></pre>