如何在单击按钮时更新WPFToolkit AreaSeries图表

<Grid>
    <Button Content="更新图表" Click="Button_Click" />
    <chartingToolkit:Chart>
        <chartingToolkit:AreaSeries ItemsSource="{Binding Data}" DependentValuePath="Value" IndependentValuePath="Key" />
    </chartingToolkit:Chart>
</Grid>

public partial class MainWindow : Window
{
    public ObservableCollection<KeyValuePair<string, int>> Data { get; set; }

    public MainWindow()
    {
        InitializeComponent();
        Data = new ObservableCollection<KeyValuePair<string, int>>();
        DataContext = this;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        // 在按钮点击事件中更新图表数据
        Data.Clear();
        Data.Add(new KeyValuePair<string, int>("数据1", 10));
        Data.Add(new KeyValuePair<string, int>("数据2", 20));
        Data.Add(new KeyValuePair<string, int>("数据3", 30));
    }
}