This sample should give you an idea of both how you can override the badge template for a series, and how you can store additional information about a series to bind against from the badge template.

<Window.Resources>
        <local:TestData x:Key="data" />
        
        <DataTemplate x:Key="customTemplate">
            <Rectangle Width="15" Height="15" 
                       Stroke="Black"
                       StrokeThickness="2"
                       Fill="{Binding Path=Series.(local:ChartInfo.LegendBrush)}"
                       />
        </DataTemplate>
    </Window.Resources>
    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        <igChart:Legend x:Name="legend1" Grid.Column="1" VerticalAlignment="Top" />
        
        <igChart:XamDataChart x:Name="theChart" Legend="{Binding ElementName=legend1}">
            <igChart:XamDataChart.Axes>
                <igChart:NumericYAxis x:Name="yAxis" />
                <igChart:CategoryXAxis 
                    x:Name="xAxis"
                    ItemsSource="{StaticResource data}"
                    Label="{}{Label}"/>
            </igChart:XamDataChart.Axes>
            <igChart:XamDataChart.Series>
                <igChart:ColumnSeries
                    LegendItemBadgeTemplate="{StaticResource customTemplate}"
                    x:Name="series"
                    Title="Series 1"
                    ItemsSource="{StaticResource data}"
                    XAxis="{Binding ElementName=xAxis}"
                    YAxis="{Binding ElementName=yAxis}"
                    ValueMemberPath="Value" 
                    local:ChartInfo.LegendBrush="Red"
                    />
                <igChart:ColumnSeries
                    LegendItemBadgeTemplate="{StaticResource customTemplate}"
                    x:Name="series2"
                    Title="Series 2"
                    ItemsSource="{StaticResource data}"
                    XAxis="{Binding ElementName=xAxis}"
                    YAxis="{Binding ElementName=yAxis}"
                    ValueMemberPath="Value"
                    local:ChartInfo.LegendBrush="Green"
                    />
                <igChart:ColumnSeries
                    LegendItemBadgeTemplate="{StaticResource customTemplate}"
                    x:Name="series3"
                    Title="Series 3"
                    ItemsSource="{StaticResource data}"
                    XAxis="{Binding ElementName=xAxis}"
                    YAxis="{Binding ElementName=yAxis}"
                    ValueMemberPath="Value"
                    local:ChartInfo.LegendBrush="Blue"/>
            </igChart:XamDataChart.Series>
        </igChart:XamDataChart>
    </Grid>

And code behind:

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }

    public class TestData
        : ObservableCollection<TestDataItem>
    {
        public TestData()
        {
            Add(new TestDataItem()
            {
                Label = "A",
                Value = 1
            });
            Add(new TestDataItem()
            {
                Label = "B",
                Value = 2
            });
            Add(new TestDataItem()
            {
                Label = "C",
                Value = 3
            });
            Add(new TestDataItem()
            {
                Label = "D",
                Value = 4
            });
        }
    }

    public class TestDataItem
    {
        public string Label { get; set; }
        public double Value { get; set; }
    }

    public class ChartInfo
    {
        public static Brush GetLegendBrush(DependencyObject obj)
        {
            return (Brush)obj.GetValue(LegendBrushProperty);
        }

        public static void SetLegendBrush(DependencyObject obj, Brush value)
        {
            obj.SetValue(LegendBrushProperty, value);
        }

        public static readonly DependencyProperty LegendBrushProperty =
            DependencyProperty.RegisterAttached("LegendBrush", typeof(Brush), typeof(ChartInfo));
    }

Hope this helps! Sorry about the delay.

-Graham

Graham Murray"]

Are the points the same for every item in the series? Or do they differ? You could store them in an attached property on the Series and then bind at them on the series. 

Can you please provide an example of how to do this?

Yes, all of the items for a series are the same shape  but individual items might be rendered larger using a RenderTransform (as discussed in other questions I've written).

Sorry for the novice line of questioning but would you be able to give me an example of creating such an attached property in the code behind?

I'm still a bit fuzzy on some of these template and binding ideas.  

Right now I've got something like this in the code behind:

Dictionary<int, string> yValToPolyStringDict;

which just holds the series polygon strings (like "0,1 1,1 0.5,1") and I do a lookup when building the series initially and each of the points in the series has a copy of that polygon string.  It would be better I'm sure to get out of that situation and have the series hold the polygon info but I wasn't sure how to do that.  Is this what you're talking about with the attached property?

How could I specify the static badge for the series instead?

Ultimately, all this comes back to my desire to specify a RenderTransform on points based on a Selected property in the underlying data.

I hope this makes sense.

Thanks,

Matt