SSRS 2008 r2 use 2 iif statements

When I want to hide the heading in an SSRS 2008 R2 report, I will also want to set the location of the tablix  to 0,0.

Thus can you tell me or show me in code how to accomplish the following two tasks: 1. User want to hide header values? Place this is a parameter value? 2. In the same iif group of statement(s): a. hide the headers of the report, b. set the location of the tablix to 0,0.