如何在底部定位wpftoolkit柱形图传奇？

Question

wpftoolkit柱形图将图例自动定位在图表的右侧。我想知道如何将传奇放在底部？

XAML ：

<DVC:Chart Canvas.Top="80" Canvas.Left="10" Name="colChart" Width="380" Height="250" Background="Azure">
    <DVC:Chart.Series>
        <DVC:ColumnSeries Title="Daily Sales" IndependentValueBinding="{Binding Path=Key}" DependentValueBinding="{Binding Path=Value}">
        </DVC:ColumnSeries>
    </DVC:Chart.Series>
</DVC:Chart>

CS ：

public Analysis()
{
    InitializeComponent();
    LoadColumnChartData();
}

private void LoadColumnChartData()
{
    ((ColumnSeries)colChart.Series[0]).ItemsSource =

    new KeyValuePair<string, int>[]{
    new KeyValuePair<string, int>("Col3", 240),
    new KeyValuePair<string, int>("Col2", 170),
    new KeyValuePair<string, int>("Col1", 120) };  
}