I can't get this to work (Additive Blend function)

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GAH! I forgot the ()! :P

Why do so many commands with no parameters use ()s? Or is that to keep from confusing them with handles?

Oh well, thanks Luke. :D I had a feeling my technique was right and the mistake was something simple like that. :P I'll have to remember to check for ()'s in the command descriptions and example code, from now on.