What do you need exactly?

Looks like there is a bit of a functionality hole there for the auto generated case. I couldn't find a straightforward way to make the series title equal the key for that series.
So you may want to make a feature request. But you can do the below to work around the missing functionality.

<UserControl.Resources>
        <local:TestEmissionsCollection x:Key="data" />
        <igChart:GroupBy 
            x:Key="grouped"
            ItemsSource="{StaticResource data}" 
            GroupMemberPath="Date" 
            KeyMemberPath="Installation" 
            ValueMemberPath="Emission" />
        
        <local: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='_Emission'}"/>
            </StackPanel>
        </DataTemplate>
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        <igChart:XamDataChart x:Name="theChart"
                              Legend="{Binding ElementName=legend1}">
            <igChart:XamDataChart.Axes>
                <igChart:CategoryXAxis x:Name="xAxis" 
                                       ItemsSource="{StaticResource grouped}"
                                       Label="{}{Key}"/>
                <igChart:NumericYAxis x:Name="yAxis" />
            </igChart:XamDataChart.Axes>

            <igChart:XamDataChart.Series>
                <igChart:StackedColumnSeries x:Name="stack"
                                             ItemsSource="{StaticResource grouped}"
                                             XAxis="{Binding ElementName=xAxis}"
                                             YAxis="{Binding ElementName=yAxis}"
                                             AutoGenerateSeries="True"
                                             LegendItemTemplate="{StaticResource keyLegendItemTemplate}"
                                             >
                   
                </igChart:StackedColumnSeries>
            </igChart:XamDataChart.Series>
        </igChart:XamDataChart>
        
        <igChart:Legend x:Name="legend1" Grid.Column="1" />
    </Grid>
</UserControl>

And code behind:

 public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
    }

    public class TestEmissionsCollection
        : ObservableCollection<InstalationEmissionDateInformation>
    {
        public TestEmissionsCollection()
        {
            Add(new InstalationEmissionDateInformation("A", 5, "1/1/2012", 1));
            Add(new InstalationEmissionDateInformation("B", 2, "1/1/2012", 1));
            Add(new InstalationEmissionDateInformation("C", 7, "1/1/2012", 1));
            Add(new InstalationEmissionDateInformation("A", 6, "1/2/2012", 1));
            Add(new InstalationEmissionDateInformation("B", 3, "1/2/2012", 1));
            Add(new InstalationEmissionDateInformation("C", 8, "1/2/2012", 1));
            Add(new InstalationEmissionDateInformation("A", 6, "1/3/2012", 1));
            Add(new InstalationEmissionDateInformation("B", 3, "1/3/2012", 1));
            Add(new InstalationEmissionDateInformation("C", 6, "1/3/2012", 1));
            Add(new InstalationEmissionDateInformation("A", 4, "1/4/2012", 1));
            Add(new InstalationEmissionDateInformation("B", 3, "1/4/2012", 1));
            Add(new InstalationEmissionDateInformation("C", 7, "1/4/2012", 1));
        }
    }

    public class InstalationEmissionDateInformation
    {
        public string Installation { get; set; }
        public Decimal Emission { get; set; }
        public string Date { get; set; }
        public Decimal Assignation { get; set; }

        public InstalationEmissionDateInformation(
            string installation, 
            Decimal emission, 
            string date, 
            Decimal assignation)
        {
            Installation = installation;
            Emission = emission;
            Date = date;
            Assignation = assignation;
        }
    }

    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();
        }
    }

Hope this helps!
-Graham

There is no luck, it shows "Series Title".

By the way, I am getting a problem that I have posted in this forum, that when I ask my server to change the data to show, it does not paint any bar, and I have realized that the legend neither changes. I know this because it must show 4 elements when I change my detail option and it continues showing 6 of my default choice.

Did you properly merge in all the changes from the sample I posted? It sounds like you are not setting the LegendItemTemplate

-Graham

no luck

Is GroupBy still available for WPF in version 15.1?

What is the namespace for "igChart"?

Snippet:

1. <UserControl.Resources>  
2.         <local:TestEmissionsCollection x:Key="data" />  
3.         <igChart:GroupBy   
4.             x:Key="grouped"  
5.             ItemsSource="{StaticResource data}"   
6.             GroupMemberPath="Date"   
7.             KeyMemberPath="Installation"   
8.             ValueMemberPath="Emission" />  
9.     </UserControl.Resources>  

Thanks,

Michael

Using the Sample above how do we properly format the Tooltip value?

Currently it is only displaying the value not the name.

Current Tooltip reads: Series Title: 7

Ideally we want: Emission: 7.

Thanks,

Michael

Using the sample above, how to we get the tooltip to provide meaningful text?

<igChart:StackedColumnSeries x:Name="stack"
ItemsSource="{StaticResource grouped}"
 XAxis="{Binding ElementName=xAxis}"
 YAxis="{Binding ElementName=yAxis}"
 AutoGenerateSeries="True"
 ShowDefaultTooltip="True">
</igChart:StackedColumnSeries>

See attached screenshot.

Thanks,

Michael

Got it now that I am awake. :-)

<Window x:Class="WpfAppStackedColumnSerie.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfAppStackedColumnSerie"
xmlns:igChart="clr-namespace:Infragistics.Controls.Charts;assembly=InfragisticsWPF4.Controls.Charts.XamDataChart.v14.2"
xmlns:ig="http://schemas.infragistics.com/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<local:TestEmissionsCollection x:Key="data" />
<ig:GroupBy x:Key="grouped"
ItemsSource="{StaticResource data}"
GroupMemberPath="Date"
KeyMemberPath="Installation"
ValueMemberPath="Emission" />
</Window.Resources>
<Grid>