title: widgetDefaultSelected() method never triggered?
body: <p>Suppose I have two radio buttons, I want one to be default selected, and I want the <code>SelectionListener</code> to do some action.</p>
  
  <p>When I tried the obvious way it didn't work:</p>
  
  <pre><code>Button button = new Button(parent, SWT.RADIO) ;
  button.setSelection(true) ;
  
  button.addSelectionListener( new SelectionAdapter() {
      public void widgetDefaultSelected(SelectionEvent e){
          doAction() ;
      }
  }) ;
  </code></pre>
  
  <p><code>doAction()</code> is never triggered...</p>
  
  <p>Can anybody explain why the <code>SelectionEvent</code> for the default selection is never triggered?</p>