Bug 55592 [Contributions] SubActionBars does not properly handle menu listeners
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubContributionManager.java
/**
	 * Maps each item in the manager to a wrapper.  The wrapper is used to 
	 * control the visibility of each item.
	 */
	private Map mapItemToWrapper = new HashMap();
	/**
	 * The visibility of the manager,
	 */
	private boolean visible = false;
	/**
	 * Constructs a new <code>SubContributionManager</code>
	 *
	 * @param mgr the parent contribution manager.  All contributions made to the
	 *      <code>SubContributionManager</code> are forwarded and appear in the
	 *      parent manager.
	 */
	public SubContributionManager(IContributionManager mgr) {
		super();
		parentMgr = mgr;
	}
	/* (non-Javadoc)
	 * Method declared on IContributionManager.
	 */
	public void add(IAction action) {
		add(new ActionContributionItem(action));
	}
	/* (non-Javadoc)
	 * Method declared on IContributionManager.
	 */
	public void add(IContributionItem item) {