Untitled

Is an object with an event attached and no references to it eligable for garbage collection?
public void DispatchCallbackAfter(Action callback, TimeSpan period)
    {
        DispatcherTimer timer = new DispatcherTimer(DispatcherPriority.Normal, AppSettings.MainWindow.Dispatcher);
        timer.Tick += new EventHandler(DispatchCallback);
        timer.Interval = period;
        timer.Tag = new object[] {timer, callback};
        timer.Start();
    }

    private void DispatchCallback(object sender, EventArgs args)
    {
        DispatcherTimer t = (DispatcherTimer)sender;
        t.Stop();
        ((Action)((object[])t.Tag)[1])();
    }