Bug 317405 [Model] HandledItem should be abstract
Looks like an oversight the only real types are HandledMenuItem and HandledToolItem.
bundles/org.eclipse.e4.ui.model.workbench.edit/src/org/eclipse/e4/ui/model/application/ui/menu/provider/ToolItemItemProvider.java
fireNotifyChanged(new ViewerNotification(notification, notification.getNotifier(), true, false));
				return;
		}
		super.notifyChanged(notification);
	}
	/**
	 * This adds {@link org.eclipse.emf.edit.command.CommandParameter}s describing the children
	 * that can be created under this object.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	protected void collectNewChildDescriptors(Collection<Object> newChildDescriptors, Object object) {
		super.collectNewChildDescriptors(newChildDescriptors, object);
		newChildDescriptors.add
			(createChildParameter
				(MenuPackageImpl.Literals.TOOL_ITEM__MENU,
				 MMenuFactory.INSTANCE.createMenu()));
		newChildDescriptors.add
			(createChildParameter
				(MenuPackageImpl.Literals.TOOL_ITEM__MENU,
				 MMenuFactory.INSTANCE.createPopupMenu()));
		newChildDescriptors.add
			(createChildParameter
				(MenuPackageImpl.Literals.TOOL_ITEM__MENU,
				 MMenuFactory.INSTANCE.createRenderedMenu()));
	}
}