Most likelly your cell has a CDF param named "model", just try to output inst->model in your script.
If it is so, the you can do inst->model = "nchhvt", after you have changed the cell name (master).
If inst->model is nil, then you have to look in your CDF paras tabel to find the real name of the property.
Your suggestion works fine. I think my question is resolved. = )
Thanks and Regards,