title: change text once it is added on canvas
body: <p>In fabric-js, i am making Group of Rect and text field and then adding it to the canvas. i am using following code  , but can i change the Text of text field once it is added in canvas .</p>
  
  <p>I have made Fiddle Please Check,</p>
  
  <blockquote>
    <p><a href="http://jsfiddle.net/HAb4N/5/" rel="nofollow">http://jsfiddle.net/HAb4N/5/</a></p>
  </blockquote>
  
  <pre><code>var canvas = new fabric.Canvas('c');
  
  var Bar = new fabric.Text('Bar', {selectable: false, top: 50, left: 10});
  
  
  var rect = new fabric.Rect({width: 100, height: 100, left: 100, top: 100, fill: 'red'});
  var group = new fabric.Group([rect, Bar], {selectable: true, top: 50, left: 100});
  canvas.add(group);
  
  canvas.renderAll();
  
  $(document).click(function(e) {
      console.log('click');
      console.log('ActiveObject', canvas.getActiveObject());
      console.log('ActiveGroup', canvas.getActiveGroup());
      Bar.set('Text','Selectedoooooooo');
  });
  </code></pre>