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/basic/provider/WindowItemProvider.java
* @generated
	 */
	@Override
	protected void collectNewChildDescriptors(Collection<Object> newChildDescriptors, Object object) {
		super.collectNewChildDescriptors(newChildDescriptors, object);
		newChildDescriptors.add
			(createChildParameter
				(UiPackageImpl.Literals.CONTEXT__PROPERTIES,
				 ((EFactory)MApplicationFactory.INSTANCE).create(ApplicationPackageImpl.Literals.STRING_TO_STRING_MAP)));
		newChildDescriptors.add
			(createChildParameter
				(CommandsPackageImpl.Literals.HANDLER_CONTAINER__HANDLERS,
				 MCommandsFactory.INSTANCE.createHandler()));
		newChildDescriptors.add
			(createChildParameter
				(BasicPackageImpl.Literals.WINDOW__MAIN_MENU,
				 MMenuFactory.INSTANCE.createMenu()));
		newChildDescriptors.add
			(createChildParameter
				(BasicPackageImpl.Literals.WINDOW__MAIN_MENU,
				 MMenuFactory.INSTANCE.createPopupMenu()));
		newChildDescriptors.add
			(createChildParameter
				(BasicPackageImpl.Literals.WINDOW__MAIN_MENU,
				 MMenuFactory.INSTANCE.createRenderedMenu()));
		newChildDescriptors.add
			(createChildParameter
				(BasicPackageImpl.Literals.WINDOW__WINDOWS,
				 MBasicFactory.INSTANCE.createWindow()));
		newChildDescriptors.add