Bug 7235 [Contributions] Need dispose() for action delegates
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubMenuManager.java
/**
	 * The parent menu manager.
	 */
	private IMenuManager parentMgr;
	/**
	 * 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;
/**
 * Constructs a new manager.
 *
 * @param mgr the parent manager.  All contributions made to the 
 *      <code>SubMenuManager</code> are forwarded and appear in the