template<typename ActivatableWidgetT> ActivatableWidgetT * AddWidget ( [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UCommonActivatableWidget](API\Plugins\CommonUI\UCommonActivatableWidget) > ActivatableWidgetClass, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void(ActivatableWidgetT &)> InstanceInitFunc )