reporting services - Conditional Formatting for all columns in a tablix in SSRS 2008 R2 -

I need to generate verification report with 10 columns. In the parameters, the user will select the column name and the validation type (zero, blank). Now I would like to highlight empty and empty cells for better focus. After selecting the entire extension column in tablix, this expression = switch on background color properties (Me.Value = "", "Blue ", IsNothing (Me.value)," Red "). This is blue painting for tap record, but there is no color change in the empty record.

Can you please help me in this regard ...