WPF Toolkit Chart Can't Add Series From Code-Behind

I have the Feb. 2010 version of WPF Toolkit installed.  I need to be able to dynamically add LineSeries to a chart.  The following code SHOULD work:

Imports System.Windows.Controls.DataVisualization.Charting
Imports System.Collections.ObjectModel

Class MainWindow

    Dim procVal1 As New ObservableCollection(Of KeyValuePair(Of Integer, Double))

    Private Sub MainWindow_Initialized(sender As Object, e As System.EventArgs) Handles Me.Initialized

        procVal1.Add(New KeyValuePair(Of Integer, Double)(1, 410.3))
        procVal1.Add(New KeyValuePair(Of Integer, Double)(1, 411.3))
        procVal1.Add(New KeyValuePair(Of Integer, Double)(1, 412.3))

        Dim mySeries As New System.Windows.Controls.DataVisualization.Charting.LineSeries
        With mySeries
            .Title = "1"
            .DependentValuePath = "Value"
            .IndependentValuePath = "Key"
            .ItemsSource = procVal1
            .IsSelectionEnabled = True
            .ItemsSource = procVal1
        End With
        me.LineChart.Series.Add(mySeries)

    End Sub

End Class

While executing the code, when I get to the line that creates the LineSeries object, execution stops with the following error:

No Source Available.
Locating source for 'C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\LineSeries.cs'. Checksum: MD5 {1b c6 9c 8d 23 3b 86 df 36 1f c1 94 a2 a3 79 66}
The file 'C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\LineSeries.cs' does not exist.
Looking in script documents for 'C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\LineSeries.cs'...
Looking in the projects for 'C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\LineSeries.cs'.
The file was not found in a project.
Looking in directory 'c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\crt\src\'...
Looking in directory 'c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\src\mfc\'...
Looking in directory 'c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\src\atl\'...
Looking in directory 'c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\include\'...
The debug source files settings for the active solution indicate that the debugger will not ask the user to find the file: C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\LineSeries.cs.
The debugger could not locate the source file 'C:\dd\WPF_1\src\wpf\src\ControlsPack\WPFToolkit\DataVisualization\Charting\Series\LineSeries.cs'.

There is no LineSeries.cs file that I can find in my PC.  I tried uninstalling and re-installing the toolkit.  No help.  I can still define line series in XAML ok, but need to be able to add them dynamically from code-behind.

Any way to solve this?

Thanks...

Ron Mittelman