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Gets the chart format of the wall.
The returned IChartFormat object provides access to the wall's fill and line formatting for a 3-D chart.
IChartFormat Format { get; }
ReadOnly Property Format As IChartFormat
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered3D, 20, 20, 360, 220).Chart;
IChartFormat format = chart.BackWall.Format;
format.Fill.Color.RGB = Color.Red;