Xaml 检测哪个子控件接收到指针*事件

我有一个容器控件，它处理PointerPressed和PointerMoved事件

容器包含一组按钮

在处理事件时，我如何确定哪个按钮实际接收到它

    mainPage.AddHandler(PointerPressedEvent, new PointerEventHandler(pointerPressedHandler), true);        
    private void pointerPressedHandler(object sender, PointerRoutedEventArgs e)
    {
        var p = e.GetCurrentPoint(null); // maybe can be done using position info?
        var s = e.OriginalSource as Border; // OriginalSource is a Border, not the Button, and I don't seem to be able to get to the Button from the Border

        // todo - determine which button was clicked
    }

这项工作：

    private void pointerPressedHandler(object sender, PointerRoutedEventArgs e)
    {
        var p = e.GetCurrentPoint(null);
        var elements = VisualTreeHelper.FindElementsInHostCoordinates(p.Position, mainPage, false);

        Button foundButton;
        foreach (var item in elements)
        {
            foundButton = item as Button;
            if (foundButton != null)
            {
                System.Diagnostics.Debug.WriteLine("found button: " + foundButton.Name);
            }
        }
    }