Bug 7235 [Contributions] Need dispose() for action delegates
bundles/org.eclipse.jface/src/org/eclipse/jface/action/MenuManager.java
/**
	 * The menu control; <code>null</code> before
	 * creation and after disposal.
	 */
	private Menu menu = null;
	
	/**
	 * List of registered menu listeners (element type: <code>IMenuListener</code>).
	 */
	private ListenerList listeners = new ListenerList(1);
	/**
	 * The menu id.
	 */
	private String id;
	/**
	 * The menu item widget; <code>null</code> before
	 * creation and after disposal. This field is used
	 * when this menu manager is a sub-menu.
	 */
	private MenuItem menuItem;
	/**
	 * The text for a sub-menu.