title: add label to check box item in smart gwt
body: <p>I need to add a label to my checkbox in smart GWT. For example, I have three fruits: apple, mango and banana. How can I add the label Fruits as heading. I am also unable to use CheckboxGroup.</p>
  
  <pre><code>CheckBox check1 = new CheckBox();
  check1.setBoxLabel("Classical");
  
  CheckBox check2 = new CheckBox();
  check2.setBoxLabel("Rock");
  check2.setValue(true);
  
  CheckBox check3 = new CheckBox();
  check3.setBoxLabel("Blue");
  
  CheckBoxGroup checkGroup = new CheckBoxGroup();
  checkGroup.setFieldLabel("Music");
  checkGroup.add(check1);
  checkGroup.add(check2);
  checkGroup.add(check3);
  </code></pre>