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
	public String getCreateChildText(Object owner, Object feature, Object child, Collection<?> selection) {
		Object childFeature = feature;
		Object childObject = child;
		boolean qualify =
			childFeature == UiPackageImpl.Literals.ELEMENT_CONTAINER__CHILDREN ||
			childFeature == BasicPackageImpl.Literals.WINDOW__SHARED_ELEMENTS ||
			childFeature == BasicPackageImpl.Literals.WINDOW__WINDOWS ||
			childFeature == BasicPackageImpl.Literals.WINDOW__MAIN_MENU;
		if (qualify) {
			return getString
				("_UI_CreateChild_text2", 
				 new Object[] { getTypeText(childObject), getFeatureText(childFeature), getTypeText(owner) });
		}
		return super.getCreateChildText(owner, feature, child, selection);
	}
	/**
	 * Return the resource locator for this item provider's resources.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 */
	@Override
	public ResourceLocator getResourceLocator() {
		return UIElementsEditPlugin.INSTANCE;
	}
}