Silverlight Background Worker - Invalid ThreadAccess

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Silverlight4

I don't know which thread to access for the Dowork process:

I have the following code in the DomainDataSource LoadedData

<pre lang="vb">If (DataGrid.ItemsSource IsNot Nothing) Then
            Dim count As Integer = DataGrid.ItemsSource.OfType(Of Object)().Count()
            lblCount_Stat.Content = "Count: " & count
        End If

I get an Invalid Thread Access when I try to access the datagrid as it is loading

<pre lang="vb">Private Sub BackgroundWorker_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs) Handles BackgroundWorker.DoWork
        Dim result As String

        result = Me.DataGrid.ItemsSource.OfType(Of Object)().Count()

        e.Result = result
    End Sub