This method is called to signal that a dependent loading operation has completed. Call IDesignerLoaderService.DependentLoadComplete(bool, ICollection) once for every process that was registered by calling IDesignerLoaderService.AddLoadDependency, which has already completed.

If the dependent load succeeds, the caller sets the successful parameter to true and passes either an empty collection or null to the errorCollection parameter. If the dependent load encounters errors, the caller sets the successful parameter to false and passes a collection of exceptions that indicate the reason or reasons for failure to the errorCollection parameter.