How do I use RDLC Boolean Parameters?

I have an rdlc report (VS 2010 DESKTOP App, NOT Web App).

I created a boolean parameter called "showMoney", that hides the money columns when not true.

HOWEVER:

There is no way to pass in a boolean on the ReportViewer.

I told the parameter's Default value to be "true" (without quotes) but that does not work.  The report works as if it's false.  Now I am trying to send in the value from the C# code, and I'm not sure how, as there is no way to pass in a boolean, only string and string[].  What does this thing want? "Yes/No", "0/1", "true/false", "aye/nay"?  Why are there NO EXAMPLES of doing this anywhere???  All the examples just assume strings!  If you make a boolen parameter in a report, it should accept a boolean as a parameter!

this.reportViewer1.LocalReport.SetParameters(new Microsoft.Reporting.WinForms.ReportParameter("showMoney", "true"));

I'd rather live with false hope than with false despair.