void Initialize ( class [FNullApplication](API\Runtime\ApplicationCore\Null\FNullApplication) *const Application, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FGenericWindowDefinition](API\Runtime\ApplicationCore\GenericPlatform\FGenericWindowDefinition) > & InDefinition, const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FNullWindow](API\Runtime\ApplicationCore\Null\FNullWindow) > & InParent, const bool bShowImmediately )