Hello,

This can be achieved by retemplating the ColumnChart's DataPoints. I have been looking into this and have created a sample style for you to achieve your goal:

            <Style TargetType="igChart:ColumnChartDataPointTemplate">               

                <Setter Property="Template">

                    <Setter.Value>

                        <ControlTemplate TargetType="igChart:ColumnChartDataPointTemplate">

                            <Grid >

                                <Grid.RowDefinitions>

                                    <RowDefinition Height="Auto"   />

                                    <RowDefinition Height="*" />

                                </Grid.RowDefinitions>

                                <Grid    Width="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Width}"

                                         Height="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Width}">

                                    <Ellipse Stretch="Fill" 

                                             Fill="{TemplateBinding Stroke}" />

                                    <Ellipse Margin="{TemplateBinding BorderThickness}"

                                             Stretch="Fill"                           

                                             Fill="{TemplateBinding Fill}" />

                                </Grid>

                                <Border x:Name="RootElement"

                                        Width="3"

                                        Grid.Row="1"

                                        BorderBrush="{TemplateBinding Stroke}"

                                        Background="{TemplateBinding Stroke}"

                                        BorderThickness="{TemplateBinding BorderThickness}"

                                         />

                            </Grid>

                        </ControlTemplate>

                    </Setter.Value>

                </Setter>

            </Style>

Please let me know if you require any clarification or further assistance on the matter.

Sincerely,

Petar Monov

Developer Support Engineer

Infragistics Bulgaria

www.infragistics.com/support