[RESOLVED] iif problem with reportviewer

Hi

On a report created with the reportviewer I have a field linked to a database

ie Fields!fuelwt.Value

When the report is run the value is displayed correctly from the database

ie 800

Problem I have is when using an expression in the 'color' property of that fields text box.

ie =Iif(Fields!fuelwt.Value >900, "Black", "Red")

Regardless of the value or the colors that I add the color is always black. Obviously if I add a color in the color properties the color is displayed OK but when I have the above entered the expression appears to be ignored

Any ideas please?
thanks
Gray