public class ApplicationActionBarAdvisor extends ActionBarAdvisor {
...
MenuManager fileMenu;
MenuManager searchSubMenu; 
...
protected void fillMenuBar(IMenuManager menuBar) {
   
   fileMenu = new MenuManager("&File", "file.menu.id");
   fileMenu.add(new Separator(IWorkbenchActionConstants.MB_ADDITIONS));    	
   menuBar.add(fileMenu);

   IMenuService menuService = (IMenuService) PlatformUI.getWorkbench().getService(IMenuService.class);

   AbstractContributionFactory searchContribution = new AbstractContributionFactory
      ("menu:file.menu.id?after=additions",Activator.PLUGIN_ID)    {
         public void createContributionItems(IServiceLocator serviceLocator, IContributionRoot additions) {
	
         searchSubMenu = new MenuManager("Sea&rch", "mymenu");
	 CommandContributionItemParameter itemParam = 
            new CommandContributionItemParameter(serviceLocator, "my.id", distributed.dev.ide.commands.newwizardcommand", 
         SWT.PUSH);
	 
         CommandContributionItem item =	new CommandContributionItem(itemParam);
	 searchSubMenu.add(item);
	 additions.addContributionItem(searchSubMenu, null);
      };
   };

   menuService.addContributionFactory(searchContribution);
		
}
    
    @Override
    public void dispose() {
    	
    	/**
    	 * MenuManagers are not disposed, so dispose it.
    	 * See http://hexapixel.com/2009/05/22/menumanagers-and-you
    	 */
    	if (searchSubMenu != null) {
    		searchSubMenu.dispose();
    		searchSubMenu = null;
    	}  

        if (fileMenu != null) {
    		fileMenu.dispose();
    		fileMenu = null;
    	}    	
    	super.dispose();
    }
} // end ApplicationActionBarAdvisor