Formatting subtotals in Matrix reports

I am trying to alter the color of a cell of a subtotal based on the value of the subtotal.
Example: =IIF(Subtotal.Value < 20 ,"Brown","Blue")
This doesn't work. How do I refer to the value of a subtotal inside an expression' I think it has something to do with InScope(). I have definitely clicked the little green tab and am getting the correct properties window.Please see this posting:
http://msdn.microsoft.com/newsgroups/default.aspx?dg=microsoft.public.sqlserver.reportingsvcs&mid=c9b1dcda-cd35-4669-bb9b-4076ad21ed43
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it@.discussions.microsoft.com> wrote in message
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> I am trying to alter the color of a cell of a subtotal based on the value
of the subtotal.
> Example: =IIF(Subtotal.Value < 20 ,"Brown","Blue")
> This doesn't work. How do I refer to the value of a subtotal inside an
expression' I think it has something to do with InScope(). I have
definitely clicked the little green tab and am getting the correct
properties window.