ITChart.GetFreeSeriesColor
ITChart

function GetFreeSeriesColor(CheckBackgroundColor: WordBool): OLE_COLOR;

Type Library
TeeChartx

Description
The GetFreeSeriesColor function returns a color from the default color palette not used by any Series. The CheckBackGround parameter controls if the returned color should or shouldn't be the Chart.Panel.BackWallColor color. This function returns a Color which is not used by any Series in the Chart.