Bug 55592 [Contributions] SubActionBars does not properly handle menu listeners
bundles/org.eclipse.jface/src/org/eclipse/jface/action/SubMenuManager.java
*/
	public boolean getRemoveAllWhenShown() {
		return false;
	}
	/**
	 * Returns the menu wrapper for a menu manager.
	 * <p>
	 * The sub menus within this menu are wrapped within a <code>SubMenuManager</code> to
	 * monitor additions and removals.  If the visibility of this menu is modified
	 * the visibility of the sub menus is also modified.
	 * <p>
	 *
	 * @return the menu wrapper
	 */
	protected IMenuManager getWrapper(IMenuManager mgr) {
		if (mapMenuToWrapper == null) {
			mapMenuToWrapper = new HashMap(4);
		}
		SubMenuManager wrapper = (SubMenuManager) mapMenuToWrapper.get(mgr);
		if (wrapper == null) {
			wrapper = wrapMenu(mgr);
			mapMenuToWrapper.put(mgr, wrapper);
		}
		return wrapper;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IContributionItem#isDynamic()
	 */
	public boolean isDynamic() {
		return getParentMenuManager().isDynamic();