如何删除与BingMaps集成的指定PushPin？

Question

这是我做的代码，用于添加带有指定标记的图钉：

public void ShowPin()
    {
        Pushpin pushpin = new Pushpin();
        MapLayer.SetPosition(pushpin, new Location(44.38550, 26.09628));
        pushpin.Tag = "Alex";
        myMap.Children.Add(pushpin);
    }

如何删除名为＆＃34; x＆＃34;的标记的图钉？或＆＃34; y＆＃34; .. 谢谢！