Bug 55592 [Contributions] SubActionBars does not properly handle menu listeners
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubMenuManager.java
if (mapMenuToWrapper != null) {
			Iterator iter = mapMenuToWrapper.values().iterator();
			while (iter.hasNext()) {
				SubMenuManager wrapper = (SubMenuManager) iter.next();
				wrapper.removeAll();
			}
			mapMenuToWrapper.clear();
			mapMenuToWrapper = null;
		}
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IMenuManager#removeMenuListener(org.eclipse.jface.action.IMenuListener)
	 */
	public void removeMenuListener(IMenuListener listener) {
		getParentMenuManager().removeMenuListener(listener);
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IContributionItem#saveWidgetState()
	 */
	public void saveWidgetState() {
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IContributionItem#setParent(org.eclipse.jface.action.IContributionManager)
	 */
	public void setParent(IContributionManager parent) {
		 
		
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IMenuManager#setRemoveAllWhenShown(boolean)