var theme = Telerik.WinControls.ThemeResolutionService.GetTheme(TelerikSkinAdapter.GetThemeName("MySkin"));
      foreach (var group in theme.StyleGroups)
        foreach (var registration in group.Registrations)
          System.Diagnostics.Debug.WriteLine($"{registration.ControlName} {registration.ControlType} {registration.ElementName} {registration.ElementType}");

public RadForm1()
        {
            InitializeComponent();

            this.radGridView1.Columns.Add("Column1");
            this.radGridView1.Columns.Add("Column2");
            ChartColumn customColumn = new ChartColumn("Chart column");
            this.radGridView1.Columns.Add(customColumn);
            this.radGridView1.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;

            for (int i = 0; i < 10; i++)
            {
                this.radGridView1.Rows.Add(i, i, i);
            }
            this.radGridView1.TableElement.RowHeight = 200;
            this.radGridView1.AllowAddNewRow = false;
        }

        public class ChartCell : GridDataCellElement
        { 
            public ChartCell(GridViewColumn column, GridRowElement row) : base(column, row)
            {
            }

            RadChartElement chart = new RadChartElement();
 
            protected override void CreateChildElements()
            {
                base.CreateChildElements();
                LoadBarChart();
                this.Children.Add(chart);
            }

            private void LoadBarChart()
            {
                chart.View.AreaType = ChartAreaType.Cartesian; 
                chart.AngleTransform = 90;
                RangeBarSeries rangeBarSeries = new RangeBarSeries("End Time", "Start Time", "Summarization Date");

                rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 14, DateTime.Now.TimeOfDay.TotalMinutes + 10, "6/8/2021"));
                rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "6/8/2021"));
                rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 4, DateTime.Now.TimeOfDay.TotalMinutes + 2, "6/8/2021"));

                rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 30, DateTime.Now.TimeOfDay.TotalMinutes + 10, "6/7/2021"));
                rangeBarSeries.DataPoints.Add(new RangeDataPoint(DateTime.Now.TimeOfDay.TotalMinutes + 7, DateTime.Now.TimeOfDay.TotalMinutes + 5, "6/7/2021"));

                CategoricalAxis horizontalAxis = new CategoricalAxis();

                //horizontalAxis.Title = "Summarization Days";
                horizontalAxis.ClipLabels = false;
                horizontalAxis.LabelRotationAngle = -90;
                horizontalAxis.LabelFitMode = AxisLabelFitMode.Rotate;

                horizontalAxis.PlotMode = AxisPlotMode.BetweenTicks;
                rangeBarSeries.HorizontalAxis = horizontalAxis;

                chart.View.Series.Add(rangeBarSeries);

                rangeBarSeries.VerticalAxis.LabelFormatProvider = new MyFormatProvider();
                //rangeBarSeries.VerticalAxis.Title = "Time of the day";
                rangeBarSeries.VerticalAxis.ClipLabels = false;
                rangeBarSeries.VerticalAxis.LabelRotationAngle = -45;
                rangeBarSeries.VerticalAxis.LabelFitMode = AxisLabelFitMode.Rotate;

                LinearAxis verticalAxis = chart.View.Axes.Get<LinearAxis>(1);
                verticalAxis.Minimum = 0; //Minutes 0:00
                verticalAxis.Maximum = 1380; //Minutes 23:00
                verticalAxis.MajorStep = 60; //60 minutes in an hour

                CartesianArea area = chart.View.GetArea<CartesianArea>();
                area.ShowGrid = true;

                CartesianGrid grid = area.GetGrid<CartesianGrid>();
                grid.DrawVerticalStripes = true;
                grid.DrawHorizontalStripes = false;
            }

            protected override void SetContentCore(object value)
            {
                base.SetContentCore(value);
                //you can synchronize the chart data points according to the cell value if necessary 
            }
            
            protected override Type ThemeEffectiveType
            {
                get
                {
                    return typeof(GridDataCellElement);
                }
            }

            public override bool IsCompatible(GridViewColumn data, object context)
            {
                return data is ChartColumn && context is GridDataRowElement;
            }
        }

        public class ChartColumn : GridViewDataColumn
        {
            public ChartColumn(string fieldName) : base(fieldName)
            {
            }

            public override Type GetCellType(GridViewRowInfo row)
            {
                if (row is GridViewDataRowInfo)
                {
                    return typeof(ChartCell);
                }
                return base.GetCellType(row);
            }
        }

        public class MyFormatProvider : IFormatProvider, ICustomFormatter
        {
            public object GetFormat(Type formatType)
            {
                return this;
            }

            public string Format(string format, object arg, IFormatProvider formatProvider)
            {
                int totalminutes = Convert.ToInt32(arg);

                TimeSpan timeSpan = TimeSpan.FromMinutes(totalminutes);

                return timeSpan.ToString(@"hh\:mm");
            }
        }