Bug 55592 [Contributions] SubActionBars does not properly handle menu listeners
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubMenuManager.java
/**
	 * Constructs a new manager.
	 *
	 * @param mgr the parent manager.  All contributions made to the 
	 *      <code>SubMenuManager</code> are forwarded and appear in the
	 *      parent manager.
	 */
	public SubMenuManager(IMenuManager mgr) {
		super(mgr);
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IMenuManager#addMenuListener(org.eclipse.jface.action.IMenuListener)
	 */
	public void addMenuListener(IMenuListener listener) {
		getParentMenuManager().addMenuListener(listener);
	}
	/**
	 * The default implementation of this <code>IContributionItem</code>
	 * method does nothing. Subclasses may override.
	 */
	public void dispose() {
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IContributionItem#fill(org.eclipse.swt.widgets.Composite)
	 */
	public void fill(Composite parent) {
		if (isVisible())
			getParentMenuManager().fill(parent);
	}
	/* (non-Javadoc)