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Grafico WPF

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Precisava de uma ajudinha... eu estou a tentar criar um gráfico, intitulado por "gráfico Pizza" era o seguinte, não sei porquê não mostra as legendas... tantoneste tipo de gráfico como em outros....

Fica aqui o código que usei e uma imagem:

 <DVC:Chart Canvas.Top="80" Canvas.Left="10" Name="mcChart"   Width="400" Height="250"
           Background="Transparent" Margin="12,12,266,272">
                <DVC:PieSeries  Title="Pontos" IndependentValueBinding="{Binding Path=Key}" DependentValueBinding="{Binding Path=Value}">
                </DVC:PieSeries >

Private Sub Button1_Click(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles Button1.Click
        DirectCast(mcChart.Series(0), PieSeries).ItemsSource = _
                    New KeyValuePair(Of String, Integer)() {New KeyValuePair(Of String, Integer)("Flamento", 67),
                    New KeyValuePair(Of String, Integer)("Internacional", 85),
                    New KeyValuePair(Of String, Integer)("São Paulo", 45),
                    New KeyValuePair(Of String, Integer)("Cruzeiros", 62),
                    New KeyValuePair(Of String, Integer)("Palmeiras", 62),
                    (New KeyValuePair(Of String, Integer)("Avai", 57))}
    End Sub

retirado de: http://www.macoratti.net/09/12/wpf_graf1.htm

e o que acontece é isto:



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