Bug 55592 [Contributions] SubActionBars does not properly handle menu listeners
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubContributionManager.java
* Method declared on IContributionManager.
	 */
	public void markDirty() {
		parentMgr.markDirty();
	}
	/* (non-Javadoc)
	 * Method declared on IContributionManager.
	 */
	public void prependToGroup(String groupName, IAction action) {
		prependToGroup(groupName, new ActionContributionItem(action));
	}
	/* (non-Javadoc)
	 * Method declared on IContributionManager.
	 */
	public void prependToGroup(String groupName, IContributionItem item) {
		item.setParent(this);
		SubContributionItem wrap = wrap(item);
		wrap.setVisible(visible);
		parentMgr.prependToGroup(groupName, wrap);
		itemAdded(item, wrap);
	}
	/* (non-Javadoc)
	 * Method declared on IContributionManager.
	 */
	public IContributionItem remove(String id) {
		IContributionItem result = parentMgr.remove(id);
		if (result != null)
			itemRemoved(result);
		return result;
	}