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Gets the chart format of the legend.
IChartFormat Format { get; }
ReadOnly Property Format As IChartFormat
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
ILegend legend = chart.Legend;
IChartFormat format = legend.Format;
format.Fill.Color.RGB = Color.Red;