AutoCAD .NET :: Title Bar Not Updating

Then, I wrote a loop to save automatically a list of documents with the Save As method (Database.SaveAs). The code is the following:

doc.Database.SaveAs(path, True, DwgVersion.Current, doc.Database.SecurityParameters).

While the documents are correctly saved with the correct new name (e.g. Map1.dwg, Map2.dwg, etc.)  in the correct location, the doc.Name properties are not updated, the title bar of autocad also. They still remains Drawing1.dwg, Drawing2.dwg, etc.