E' uscita la fix per il problema in oggetto, che al momento deve essere richiesta al supporto tecnico di Microsoft oppure attendere il prossimo service pack.
Dal seguente:
http://support.microsoft.com/default.aspx?scid=kb;en-us;894392
SYMPTOMS
When you inherit a class that inherits and overrides another class in Microsoft Visual Basic .NET 2003, the overridden method in the inherited class does not appear in the Method Name box. This problem occurs when you select (Overrides) in the Class Name box of the inherited class.
RESOLUTION
Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Basic .NET 2003 service pack that contains this hotfix.