Hello,

I have been looking into your question and I can suggest you  use the Brushes Property of the XamDataChart, which is a collection with Brushes and the chart uses these colors for the series like e.g. :

                        Red

                        Yellow

                        Violet

                        blue

                        Green

                        Orange

                        Pink

                        YellowGreen

Here you can read more about it:

http://help.infragistics.com/NetAdvantage/Silverlight/2012.1/CLR4.0/?page=InfragisticsSL5.Controls.Charts.XamDataChart.v12.1~Infragistics.Controls.Charts.XamDataChart~Brushes.html

Also you can use the Series’ Brush Property, which set the color to the specific Series. Here you can find more information:

http://help.infragistics.com/NetAdvantage/Silverlight/2012.1/CLR4.0/?page=InfragisticsSL5.Controls.Charts.XamDataChart.v12.1~Infragistics.Controls.Charts.Series~Brush.html

Feel free to write me if you need any further assistance on this matter.

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:ig="http://schemas.infragistics.com/xaml"
        xmlns:TilesTest="clr-namespace:TilesTest" x:Class="TilesTest.MainWindow"
        Title="MainWindow" Height="350" Width="525"
        mc:Ignorable="d">
    <Window.Resources>
        <TilesTest:SeriesData x:Key="SD"/>
       
       
        <!--Here i chnaged the ItemsSource to a StaticResource
            I also chnaged the DataSource structure, you can see the code behind-->
       
       
        <ig:GroupBy  
                            x:Key="grouped"                            
                            ItemsSource="{Binding Source={StaticResource SD},Path=DataPoints}"  
                            GroupMemberPath="Date"  
                            KeyMemberPath="Currency"  
                            ValueMemberPath="Value" />
        <TilesTest:KeyConverter x:Key="keyConverter"/>
        <DataTemplate x:Key="keyLegendItemTemplate">
            <StackPanel Orientation="Horizontal" Margin="1" Visibility="{Binding Series.Visibility}">
                <ContentPresenter Content="{Binding}" ContentTemplate="{Binding Series.LegendItemBadgeTemplate}" />
                <ContentPresenter Content="{Binding Series.ValueMemberPath, Converter={StaticResource keyConverter}, ConverterParameter='_Value'}"/>
            </StackPanel>
        </DataTemplate>   
    </Window.Resources>
    <Grid>       
        <ig:XamDock x:Name="xmDockContainer" Margin="10" Grid.Row="1">
            <Border CornerRadius="1" Margin="5" BorderThickness="1" Grid.Row="1">
                <ig:XamDataChart x:Name="barChart"
                                 Legend="{Binding ElementName=xmLegend}"
                                 HorizontalZoomable="True"
                                 VerticalZoomable="True"
                                 >
                    <ig:XamDataChart.Axes>
                        <ig:CategoryXAxis x:Name="xmXAxis" Label="{}{Key}" ItemsSource="{StaticResource ResourceKey=grouped}">
                            <ig:CategoryXAxis.ToolTip>
                                Cash Flow Dates
                            </ig:CategoryXAxis.ToolTip>
                            <ig:CategoryXAxis.LabelSettings >
                                <ig:AxisLabelSettings Location="OutsideBottom"  Extent="55" />
                            </ig:CategoryXAxis.LabelSettings>
                        </ig:CategoryXAxis>
                        <ig:NumericYAxis x:Name="xmYAxis" >
                            <ig:NumericYAxis.LabelSettings >
                                <ig:AxisLabelSettings Location="OutsideLeft" Extent="55"/>
                            </ig:NumericYAxis.LabelSettings>
                        </ig:NumericYAxis>
                    </ig:XamDataChart.Axes>
                    <ig:XamDataChart.Series >
                       

                        <!--The AutoGenerateSeries Property should be set to True-->
                       
                       
                        <ig:StackedColumnSeries x:Name="stack"  SeriesCreated="stack_SeriesCreated"
                                                XAxis="{Binding ElementName=xmXAxis}" 
                                                YAxis="{Binding ElementName=xmYAxis}"
                                                ItemsSource="{StaticResource ResourceKey=grouped}"
                                                AutoGenerateSeries="True"
                                                LegendItemTemplate ="{StaticResource ResourceKey=keyLegendItemTemplate}"
                                                >
                        </ig:StackedColumnSeries>
                    </ig:XamDataChart.Series>
                </ig:XamDataChart>
            </Border>
            <ig:Legend x:Name="xmLegend"
                    Margin="5"
                    ig:XamDock.Edge="OutsideRight">
            </ig:Legend>
        </ig:XamDock>
    </Grid>
</Window>

2. MainWindow.xaml.cs

using System.Collections.ObjectModel;
using System.Windows;
using Infragistics.Controls.Charts;

namespace TilesTest
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void stack_SeriesCreated(object sender, Infragistics.Controls.Charts.StackedSeriesCreatedEventArgs e)
        {
            StackedFragmentSeries series = (StackedFragmentSeries)sender;

            if (series != null)
            {
                series.Title = series.ValueMemberPath.Replace("_Value", string.Empty);
            }

        }
    }

    public class SeriesData
    {
        public ObservableCollection<DataPoint> DataPoints { get; set; }

        public SeriesData()
        {
            DataPoints = new ObservableCollection<DataPoint>();
            DataPoints.Add(new DataPoint
            {
                Currency = "GBP",
                Date = "May 2001",
                Value = 1500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "USD",
                Date = "May 2001",
                Value = 2500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "EUR",
                Date = "May 2001",
                Value = 8800
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "GBPTest",
                Date = "May 2001",
                Value = 1500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "USDTest",
                Date = "May 2001",
                Value = 2500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "EURTest",
                Date = "May 2001",
                Value = 1800
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "GBP",
                Date = "May 2002",
                Value = 1500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "USD",
                Date = "May 2002",
                Value = 0
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "EUR",
                Date = "May 2002",
                Value = 0
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "GBPTest",
                Date = "May 2002",
                Value = 1500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "USDTest",
                Date = "May 2002",
                Value = 2500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "EURTest",
                Date = "May 2002",
                Value = 1800
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "GBPTest1",
                Date = "May 2001",
                Value = 1500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "USDTest1",
                Date = "May 2001",
                Value = 2500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "EURTest1",
                Date = "May 2001",
                Value = 1800
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "GBPTest1",
                Date = "May 2002",
                Value = 1500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "USDTest1",
                Date = "May 2002",
                Value = 2500
            });

            DataPoints.Add(new DataPoint
            {
                Currency = "EURTest1",
                Date = "May 2002",
                Value = 1800
            });
            //DataPoints.Add(new DataPoint
            //{
            //    Currency = "GBP2",
            //    Date = "May 2002",
            //    Value = 1500
            //});

            //DataPoints.Add(new DataPoint
            //{
            //    Currency = "USD2",
            //    Date = "May 2002",
            //    Value = 200
            //});

            //DataPoints.Add(new DataPoint
            //{
            //    Currency = "EUR2",
            //    Date = "May 2002",
            //    Value = 200
            //});

            //DataPoints.Add(new DataPoint
            //{
            //    Currency = "GBP3",
            //    Date = "May 2002",
            //    Value = 150
            //});

            //DataPoints.Add(new DataPoint
            //{
            //    Currency = "USD3",
            //    Date = "May 2002",
            //    Value = 150
            //});

            //DataPoints.Add(new DataPoint
            //{
            //    Currency = "EUR3",
            //    Date = "May 2002",
            //    Value = 150
            //});

        }
    }

    public class DataPoint
    {
        public string Date { get; set; }
        public double Value { get; set; }
        public string Currency { get; set; }
    }

}

3. KeyConverter.cs

using

System;

using

System.Windows.Data;

namespace

TilesTest

{

public class KeyConverter

:

IValueConverter

{

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

{

if (value is string && parameter is string)

{

var key = (string)value;

var param = (string)parameter;

key = key.Replace(param,

"");

return key;

}

return "";

}

public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

{

throw new NotImplementedException();

}

}

}