Unable to Set IGES Translation Parameters

I'm trying to set the author, company, and product parameters using the following code:

IGESControl_Writer writer;
Interface_Static::SetCVal("write.iges.header.company", "MyCompany");
Interface_Static::SetCVal("write.iges.header.product", "MyProduct");
Interface_Static::SetCVal("write.iges.header.author", "ThisIsMe");

However, I always get the default values in the output IGES file:

S0000001
,,31HOpen CASCADE IGES processor 6.2,13HFilename.iges, G0000001
16HOpen CASCADE 6.2,31HOpen CASCADE IGES processor 6.2,32,308,15,308,15,G0000002
,1.,2,2HMM,1,0.01,15H20080223.135350,0.0001,,4Hrice,,11,0, G0000003
15H20080223.135350,; G0000004
S 1G 4D 0P 0 T0000001

I've found that if I call writer.Model()->ApplyStatic() that the "author" and "company" values get set, but I cannot change the "product" header item.

Any guidance on how to modify these values?

Thanks.
Michael