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Gets the parent IChart that contains this wall.
The returned chart is the 3-D chart that owns this wall, such as the back wall or side wall.
IChart Parent { get; }
ReadOnly Property Parent As IChart
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered3D, 20, 20, 360, 220).Chart;
IChart parentChart = chart.BackWall.Parent;