RGB Color Settings Redux

[IEW]

I have tried to get the example that Queue posted on Nov. 22 to work on my project and have had no luck. I want to test a field for "a" and turn background Green, if its a "b" I want to turn it Red. My problem seems to be in setting up the transparent fields. What am I missing? TIA

Ivan

[-Queue-]

Right-click on each field and select Fill Pattern. Make sure the top-left option, the one with two overlapping clear squares, is selected. This is equivalent to 'transparent'.