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RADIAL is a fill style that fills a shape with a radial gradient (value equals distance from center). The gradient is using currently selected foreground and background colors.
RADIAL can be used from scripts and has the following arguments.
DrawTool.SetFillStyle("RADIAL", "ABSOLUTE,100,100,50");
Find out how Vista icons differ from XP icons.
See how RealWorld Icon Editor handles Vista icons.