XAML

                    <Chart:RadCartesianChart Grid.Row="1" x:Name="telChart">
                        <Chart:RadCartesianChart.HorizontalAxis>
                            <Chart:CategoricalAxis PlotMode="OnTicksPadded"/>
                        </Chart:RadCartesianChart.HorizontalAxis>
                        <Chart:RadCartesianChart.VerticalAxis>
                            <Chart:LinearAxis/>
                        </Chart:RadCartesianChart.VerticalAxis>
                        <Chart:LineSeries ItemsSource="{Binding}">
                            <Chart:LineSeries.CategoryBinding>
                                <Chart:PropertyNameDataPointBinding PropertyName="Category"/>
                            </Chart:LineSeries.CategoryBinding>
                            <Chart:LineSeries.ValueBinding>
                                <Chart:PropertyNameDataPointBinding PropertyName="Value"/>
                            </Chart:LineSeries.ValueBinding>

                            <Chart:ChartTrackBallBehavior.TrackInfoTemplate>
                                <DataTemplate>
                                    <StackPanel>
                                        <TextBlock Text="{Binding DataPoint.DataItem.Info}" Margin="5" Foreground="DarkSalmon"/>
                                    </StackPanel>
                                </DataTemplate>
                            </Chart:ChartTrackBallBehavior.TrackInfoTemplate>

                            <Chart:ChartTrackBallBehavior.IntersectionTemplate>
                                <DataTemplate>
                                    <Ellipse Width="10" Height="10" Fill="Tomato"/>
                                </DataTemplate>
                            </Chart:ChartTrackBallBehavior.IntersectionTemplate>
                        </Chart:LineSeries>
                        <Chart:RadCartesianChart.Behaviors>
                            <Chart:ChartTrackBallBehavior InfoMode="Multiple" ShowIntersectionPoints="True">

                                <Chart:ChartTrackBallBehavior.LineStyle>
                                    <Style TargetType="Polyline">
                                        <Setter Property="Stroke" Value="Tomato"/>
                                        <Setter Property="StrokeThickness" Value="2"/>
                                        <Setter Property="StrokeDashArray" Value="1,2"/>
                                    </Style>
                                </Chart:ChartTrackBallBehavior.LineStyle>

                                <Chart:ChartTrackBallBehavior.InfoStyle>
                                    <Style TargetType="telerikChartPrimitives:TrackBallInfoControl">
                                        <Setter Property="Background" Value="White"/>
                                    </Style>
                                </Chart:ChartTrackBallBehavior.InfoStyle>

                            </Chart:ChartTrackBallBehavior>
                        </Chart:RadCartesianChart.Behaviors>
                    </Chart:RadCartesianChart>