Circular chart in 3D using Transparency and Dark

SeriesList sList = new SeriesList();             sList.ChartType = ChartType.Circular;             sList.IsShow3D = true;             sList.Transparency = 70;             Random r = new Random();             for (int i = 0; i < 4; i++)             {                 Series sr = new Series();                 sr.Column.WidthType = ColumnWidthType.Tight;                 sr.Column.DesignType = AreaDesignType.Dark;                 for (int x = 0; x < 4; x++)                 {                     SeriesItem item = new SeriesItem();                     item.YValue = r.Next(100);                     item.Name = "item" + x.ToString();                     sr.items.Add(item);                 }                 sList.SeriesCollection.Add(sr);             }             this.hHippoChart2.Titles.Label.ForeColor = Color.SteelBlue;               this.hHippoChart2.DesignType = ChartDesignType.Simple;             this.hHippoChart2.SeriesListDictionary.Add(sList);             this.hHippoChart2.DrawChart();