API Reference > ui-abstract > UiItemsProvider > UiItemsArbiter > uiItemsApplication uiItemsApplication AccessorStatic The UiItemsApplication implementation. The application should set this to validate items from the extensions. uiItemsApplication: undefined | UiItemsApplication Returns - undefined | UiItemsApplication SetterStatic The UiItemsApplication implementation. The application should set this to validate items from the extensions. uiItemsApplication(app: undefined | UiItemsApplication): void Parameter Type Description app undefined | UiItemsApplication Returns - void Defined in ui/abstract/src/ui-abstract/UiItemsArbiter.ts Line 38 Last Updated: 29 November, 2022