How to reproduce:

LineSeries lineSeries = new LineSeries();
lineSeries.DataPoints.Add(new CategoricalDataPoint(6, "Harley"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(4, "White"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(7, "Smith"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(5, "Jones"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(3, "Marshall"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(8, "Stevens"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(7, "Brown"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(10, "Carter"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(4, "Bryant"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(5, "Mora"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(2, "Roy"));

CategoricalAxis continuousAxis = new CategoricalAxis();
continuousAxis.PlotMode = AxisPlotMode.OnTicks;
continuousAxis.LabelFormat = "{0:d}";
continuousAxis.ScaleBreakStyle = ScaleBreakStyle.Ragged;
lineSeries.HorizontalAxis = continuousAxis;
this.radChartView1.Series.Add(lineSeries);

//setup plot band
CartesianPlotBandAnnotation annotation1 = new CartesianPlotBandAnnotation();
annotation1.Axis = this.radChartView1.Axes[0] as CartesianAxis;
annotation1.From = "Bryant";
annotation1.To = "Mora";
annotation1.BackColor = Color.FromArgb(100, Color.LightBlue);
annotation1.BorderColor = Color.Black;
annotation1.BorderWidth = 1;
this.radChartView1.Annotations.Add(annotation1);

AxisScaleBreak scaleBreakItem = new AxisScaleBreak();
scaleBreakItem.Name = "Item1";
scaleBreakItem.From = "Smith";
scaleBreakItem.To = "Brown";

horizontalAxis.ScaleBreakSize = 50;
horizontalAxis.ScaleBreaks.Add(scaleBreakItem);