Bug 55592 [Contributions] SubActionBars does not properly handle menu listeners
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubContributionManager.java
item.setParent(this);
		SubContributionItem wrap = wrap(item);
		wrap.setVisible(visible);
		parentMgr.add(wrap);
		itemAdded(item, wrap);
	}
	/* (non-Javadoc)
	 * Method declared on IContributionManager.
	 */
	public void appendToGroup(String groupName, IAction action) {
		appendToGroup(groupName, new ActionContributionItem(action));
	}
	/* (non-Javadoc)
	 * Method declared on IContributionManager.
	 */
	public void appendToGroup(String groupName, IContributionItem item) {
		item.setParent(this);
		SubContributionItem wrap = wrap(item);
		wrap.setVisible(visible);
		parentMgr.appendToGroup(groupName, wrap);
		itemAdded(item, wrap);
	}
	/* (non-Javadoc)
	 * Method declared on IContributionManager.
	 *
	 * Returns the item passed to us, not the wrapper.
	 */
	public IContributionItem find(String id) {
		IContributionItem item = parentMgr.find(id);