Passing parameters to more than one crystal report

I am using a crystalreportviewer in VB.NET to show two different reports using the menu on the form. The first report has 3 parameters and the second, one parameter. I defiend the parameteres and added the valuse to the parameterfiledinfo property of the CRviewer. When each of the reports is loaded for the first time, everything is ok and I am not prompted for parameters and the parameters are passed correctly to the report, but if I reload the report or switch to the second report then I am prompted for parametes :(
How can I avoid this??