public void menuAboutToShow(IMenuManager manager) {
		IContributionItem[] items = manager.getItems();

		for (int i = 0; i < items.length; i++) {
			String id = items[i].getId();
			Integer value;
			if (forceArithIdMap.containsKey(id)) {
				IAction a = ((ActionContributionItem)items[i]).getAction();
				value = (Integer)forceArithIdMap.get(id);
				a.setChecked(context.arithmeticType == value.intValue());
			}
			else if (displayRadixIdMap.containsKey(id)) {
				IAction a = ((ActionContributionItem)items[i]).getAction();
				value = (Integer)displayRadixIdMap.get(id);
				a.setChecked(displayRadix == value.intValue());				
			}
		}
		manager.removeMenuListener(this);
	}