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Gets the parent IChart that contains this legend.
Use this property to access the chart that owns the current legend.
IChart Parent { get; }
ReadOnly Property Parent As IChart
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
ILegend legend = chart.Legend;
IChart parentChart = legend.Parent;