WPF Pie Chart - Legend and Labels MVVM DataBinding

I am trying to produce a simple pie chart with numeric values and labels for each value.  I am using an MVVM pattern and am trying to avoid code in the code behind.  I have a simple object being bound as the series data source:

C#
public class ViewModel  
{  
    public ObservableCollection<DataPoint> DataPoints  
}  

public class DataPoint  
{  
    public string Name { get; set; }  
    public decimal Value { get; set; }  

    public override string ToString()  
    {  
        return Name;  
    }  
}  

When I produce the chart, the legend and datapoints on the chart itself do not show the data point Name.  I am using a binding expression like the below:

XAML
<dxc:PieSeries2D ArgumentDataMember="Name"  
                ValueDataMember="Value"  
                LabelsVisibility="True"  
                HoleRadiusPercent="0"  
                DataSource="{Binding Path=PointsCollection, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}">  

</dxc:PieSeries2D>  

I have attached a sample project.  How would I use a DataTemplate for both the Legend and the series point labels to be able to render the values on the model that I am using as the series datasource?

Also, how to I specify that I don't want percentages, I want the actual numbers?