Hi Telerik, We are facing two issues when we are using Stepline series. ISSUE 1 : When there is only one category / data point then chart is not drawing . We have such cases and we need solution or workaround for this case <telerik:StepLineSeries> <telerik:StepLineSeries.DataPoints> <telerik:CategoricalDataPoint Category="1" Value="1.0" /> <!--<telerik:CategoricalDataPoint Category="2" Value=1.1" /> <telerik:CategoricalDataPoint Category="3" Value="1.0" /> <telerik:CategoricalDataPoint Category="4" Value="1.1" />--> </telerik:StepLineSeries.DataPoints> </telerik:StepLineSeries>ISSUE 2 :We are using marked zone but marking falling in between and not from beginning so we used margin workaround from telerik to fix (Please see code from attached xaml.cs file) Before Shifting See image After Shifting See image BELOW CODE USED TO ALIGN MARGINint categoriesCount = this.horizontalAxis.Categories.Count();double categorySlotSize = this.chart.PlotAreaClip.Width * this.chart.Zoom.Width / categoriesCount; var margin = new Thickness(-(categorySlotSize / 2), 0, 0, 0); if (!margin.ToString().Contains("Infinity")) { this.chart.Annotations.Where(x => x is CartesianMarkedZoneAnnotation).ToList() .ForEach(m => { m.Margin = margin; }); }But we are facing issue when we zoom the chart.The marking going out of actual area.Please help to resolve it. After Zooming See Image ISSUE 3 : When we are using marking for last category then the marking done for half way only.Please help to draw until end (Need to support while zooming as well) <telerik:StepLineSeries> <telerik:StepLineSeries.DataPoints> <telerik:CategoricalDataPoint Category="1" Value="1.0" /> <telerik:CategoricalDataPoint Category="2" Value="1.1" /> <telerik:CategoricalDataPoint Category="3" Value="1.0" /> <telerik:CategoricalDataPoint Category="4" Value="1.1" /> </telerik:StepLineSeries.DataPoints> </telerik:StepLineSeries> <telerik:CartesianMarkedZoneAnnotation VerticalFrom="1.0" VerticalTo="1.1" HorizontalFrom="4" Fill="Red"/>