this.ultraChart1.DoughnutChart.BreakAllSlices = true;
this.ultraChart1.DoughnutChart.Labels.Visible = false;
this.ultraChart1.DoughnutChart.Labels.LeaderLinesVisible = false;
ChartTextAppearance textApp = new ChartTextAppearance();
textApp.Row = -2;
textApp.Column = -2;
textApp.Visible = true;
textApp.ItemFormatString = "<PERCENT_VALUE:#>%";
this.ultraChart1.DoughnutChart.ChartText.Add(textApp);