WPF事件单击DesktopAlert Telerik不起作用

Question

这是我的RadDesktopAlert

我希望在单击“警报”后在浏览器中打开URL 但事件点击不起作用！

public void btnClickMe(object sender, RoutedEventArgs e)
{
    var alert = new RadDesktopAlert();
    alert.Header = "best";
    alert.Content = "https://stackoverflow.com/"    

//Not Work 
       alert.Click += new RoutedEventHandler(popup_Click);
       alert.Click +=  popup_Click;      

    RadDesktopAlertManager manager = new RadDesktopAlertManager();
    manager.ShowAlert(alert);


}
private void popup_Click(object sender, RoutedEventArgs e)
{
    test.Content = "test";
}