I open assembly. Name of an active configuration of Conf1. Then I traverse assembly components for Conf2 configuration.

Configuration conf = MD.GetConfigurationByName (Conf2);

Component2 comp = (Component2) conf.GetRootComponent() ;

object ggg = conf.GetChildren ();

I add a part and  traverse assembly components for Conf2 configuration. Conf2 is updated.

Then again I add a part and  traverse assembly components for Conf2 configuration. Conf2 isn't updated, the  part in a configuration of Conf2 is absent.

How to solve this problem?