sql server reporting services: I know you can make this work using this approach:

http://www.microsoft.com/sql/community/newsgroups/dgbrowser/en-us/default.mspx?dg=microsoft.public.sqlserver.reportingsvcs&mid=0064e121-fd26-4c83-8add-4a694e4fea7d&sloc=en-us

....but my problem is I have additional parameters to my report and when I
click a header column they are not being supplied so I get a blank page. How

You need to add the report's additional parameters (as straight
pass-through) to the Drillthrough action.

E.g. Parameter: City Value: =Parameters!City.Value


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