title: Create submenus programmatically for existing Menu created from XML
body: <p>I have created my parent menus in xml , now i don't know how to create submenus under those parents using code. That means , parents are coded in menu.xml and submenus will be loaded based on a dynamic code as and when the data is available.</p>
  
  <p>When i tried to use menu.addSubMenu it is creating a new parent menu item.</p>