Bug 55592 [Contributions] SubActionBars does not properly handle menu listeners
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubMenuManager.java
/**
	 * Maps each submenu in the manager to a wrapper.  The wrapper is used to
	 * monitor additions and removals.  If the visibility of the manager is modified
	 * the visibility of the submenus is also modified.
	 */
	private Map mapMenuToWrapper;