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Gets the IFillFormat object for the chart element.
Use the returned IFillFormat object to access and modify the fill formatting properties of the parent chart element.
IFillFormat Fill { get; }
ReadOnly Property Fill As IFillFormat
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 360, 220).Chart;
IChartFormat format = chart.ChartArea.Format;
IFillFormat fill = format.Fill;
fill.Color.RGB = Color.Red;