Bug 316298 [Compatibility] Support o.e.ui.menus visibleWhen
We need support in MCoreExpression for entire expressions created by the WorkbenchMenuService. They don't often use ReferenceExpressions to core expression definitions. PW
bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/MenuItemRenderer.java
if (UIEvents.UILabel.LABEL.equals(attName)) {
				setItemText(itemModel, menuItem);
			} else if (UIEvents.UILabel.ICONURI.equals(attName)) {
				menuItem.setImage(getImage(itemModel));
			}
		}
	};
	private EventHandler selectionUpdater = new EventHandler() {
		public void handleEvent(Event event) {
			
			if (!(event.getProperty(UIEvents.EventTags.ELEMENT) instanceof MMenuItem))
				return;
			MMenuItem itemModel = (MMenuItem) event
					.getProperty(UIEvents.EventTags.ELEMENT);
			MenuItem menuItem = (MenuItem) itemModel.getWidget();
			if (menuItem != null) {
				menuItem.setSelection(itemModel.isSelected());
			}
		}
	};
	private EventHandler enabledUpdater = new EventHandler() {
		public void handleEvent(Event event) {
			
			if (!(event.getProperty(UIEvents.EventTags.ELEMENT) instanceof MMenuItem))
				return;
			MMenuItem itemModel = (MMenuItem) event
					.getProperty(UIEvents.EventTags.ELEMENT);
			MenuItem menuItem = (MenuItem) itemModel.getWidget();
			if (menuItem != null) {
				menuItem.setEnabled(itemModel.isEnabled());