You need to find them first, then determine what's failed or missing. Is a feature or an assembly reference or what? I don't use the global reference viewer (GRV) a lot, but it should be able tell you what the children are. Once you find them, redefine them and see what's wrong.
I can't really be more specific because I don't know what's failing in your specific assembly and I don't know the GRV enough to tell you how to find the info.