How to suppress one parameter in the parameters prompt of a crystal report

Hello,

I set up one parameter value first where this parameter will not be showing up in the parameters prompt if the CrystalReportViewer is a physical control in a window form, for example, OperatorId = 1. The parameters prompt will flash out when CrystalReportViewer.Refresh() is executed, and the parameter, OperatorId, will not show up. This is what I want.

However, when the CrystalReportViewer is a instance in the code, and there is no physical  window form. The parameters prompt will not flash out when CrystalReportViewer.Refresh() is executed, even if I set up this parameter value first. Then I tried CrystalReportViewer.RefreshReport(),the parameters prompt will flash out but the parameter, OperatorId, will still show up. This is not what I want.

Does any guru know this goofy stuff and how to solve this issue? Any hints would be great appreciated. I am using SAP 2010 API. The article listed at http://scn.sap.com/thread/1928187, is not helpful in my scenario.