Bug 182714 [Contributions] Improve toolbar configurability
bundles/org.eclipse.jface/src/org/eclipse/jface/action/MenuManager.java
/**
     * A resource manager to remember all of the images that have been used by this menu.
     */
    private LocalResourceManager imageManager;
    /**
     * The overrides for items of this manager
     */
    private IContributionManagerOverrides overrides;
    /**
     * The parent contribution manager.
     */
    private IContributionManager parent;
    /**
     * Indicates whether <code>removeAll</code> should be
     * called just before the menu is displayed.
     */
    private boolean removeAllWhenShown = false;
    /**
     * Indicates this item is visible in its manager; <code>true</code> 
     * by default.
     * @since 3.3
     */
    protected boolean visible = true;
	/**
	 * allows a submenu to display a shortcut key. This is often used with the
	 * QuickMenu command or action which can pop up a menu using the shortcut.
	 */
	private String definitionId = null;
    /**
     * Creates a menu manager.  The text and id are <code>null</code>.