<Grid x:Name="LayoutRoot" Background="White">
    <toolkit:Chart Name="ch1" Title="Test Data">
        <toolkit:Chart.Series>
            <toolkit:PieSeries ItemsSource="{Binding ElementName=chartValueDomainDataSource, Path=Data}" IndependentValueBinding="{Binding Path=Description}" DependentValueBinding="{Binding Path=Value}"/>


        </toolkit:Chart.Series>

    </toolkit:Chart>

    <riaControls:DomainDataSource AutoLoad="True" d:DesignData="{d:DesignInstance my:ChartValue, CreateList=true}" Height="0" LoadedData="chartValueDomainDataSource_LoadedData" Name="chartValueDomainDataSource" QueryName="GetChartValuesQuery" Width="0">
        <riaControls:DomainDataSource.DomainContext>
            <my:ChartDomainContext />
        </riaControls:DomainDataSource.DomainContext>
    </riaControls:DomainDataSource>
</Grid>