Bind the StackGroupKey of the BarSeries when Using ChartSeriesProvider

Environment

Product Version	2025.2.521
Product	RadChartView for WPF

Description

Binding the StackGroupKey property of the BarSeries when using ChartSeriesProvider.

Solution

The StackGroupKey property of the BarSeries class is not a DependencyProperty, thus it cannot be bound directly. To bind it when using the ChartSeriesProvider functionality of RadChartView, you can implement a custom attached property. You can bind this attached property to a property in the view model of the series. To bind it, you can create a new Style for the CategoricalSeriesDescriptor instance.

In order for the StackGroupKey property to be taken into account, the CombineMode property needs to be set to either Stack or Stack100.

Adding an additional property for the StackGroupKey in the view model of the series

public class SeriesViewModel 
{ 
    //Property that holds the stack group key of the current series 
    public object StackGroupKey { get; set; } 
    public ObservableCollection<MyPointInfo> MyPoints { get; set; } 
} 

Defining the series descriptor and binding the StackGroupKey to an attached property

<telerik:ChartSeriesProvider.SeriesDescriptors> 
    <telerik:CategoricalSeriesDescriptor ItemsSourcePath="MyPoints"  
                                         CategoryPath="Category" 
                                         ValuePath="Value"> 
        <telerik:CategoricalSeriesDescriptor.Style> 
            <Style TargetType="telerik:BarSeries"> 
                <Setter Property="CombineMode" Value="Stack"/> 
                <Setter Property="local:BarSeriesExtensions.StackGroupKey" Value="{Binding StackGroupKey}"/> 
            </Style> 
        </telerik:CategoricalSeriesDescriptor.Style> 
    </telerik:CategoricalSeriesDescriptor> 
</telerik:ChartSeriesProvider.SeriesDescriptors> 

Implementing the attached property that will set the StackGroupKey of each BarSeries

public class BarSeriesExtensions 
{ 
    public static object GetStackGroupKey(DependencyObject obj) 
    { 
        return (object)obj.GetValue(StackGroupKeyProperty); 
    } 
 
    public static void SetStackGroupKey(DependencyObject obj, object value) 
    { 
        obj.SetValue(StackGroupKeyProperty, value); 
    } 
 
    public static readonly DependencyProperty StackGroupKeyProperty = 
        DependencyProperty.RegisterAttached("StackGroupKey", typeof(object), typeof(BarSeriesExtensions), new   PropertyMetadata(null, OnStackGroupKeyChanged)); 
 
    private static void OnStackGroupKeyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 
    { 
        if (e.NewValue != null) 
        { 
            BarSeries barSeries = (BarSeries)d; 
            barSeries.StackGroupKey = e.NewValue; 
        } 
    } 
}