有没有办法防止IWorkbenchWindow关闭?

所以我有我的 IWorkbenchWiondow 对象 window .
我将此侦听器添加到其中:

window.addPageListener(new IPageListener()
{
    @Override
    public void pageOpened(IWorkbenchPage page)
    {
        // method stub
    }

    /**
     * Whenever the user tries to close the workbench window, this method gets called.
     */
    @Override
    public void pageClosed(IWorkbenchPage page)
    {
        if (MessageDialog.openQuestion(page.getWorkbenchWindow().getShell(), "Question", "Do you really want to close the application?"))
        {
            // YES, then no problem, close
            return;
        }
        else
        {
            // NO
            System.out.println("Now what?");
        }
    }

    @Override
    public void pageActivated(IWorkbenchPage page)
    {
        // method stub
    }
});

我怎样才能停止 窗 如果用户说 No ?
或者我怎样才能达到同样的最终结果?