See Also: Using Colors
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If assigned, this event is triggered for each piece in a pie series immediately before it pulls a color from the default colors array. The event provides the EJSC.PiePoint object which represents the piece which needs a color, the EJSC.PieSeries which owns the piece and the EJSC.Chart which owns the series. Return a color string formatted as "rgb(<red value>, <green value>, <blue value>)", i.e. Orange would be "rgb(237,173,0)"