problem in play/call media element sound

Question

I create usercontrol name it Audio_Play..

and the code in Audio_Play.xaml.cs is :

private int _count = 8;

        // MediaElement
        private int _index = 0;

        public AudioPlayer()
        {
            InitializeComponent();

            this.Loaded += new RoutedEventHandler(AudioPlayer_Loaded);
        }

        void AudioPlayer_Loaded(object sender, RoutedEventArgs e)
        {
            for (int i = 0; i < _count; i++)
            {
                var element = new MediaElement();
                element.Volume = 0.7d;

                root.Children.Add(element);
            }
        }

private void Play(string address)
        {
            if (_index > _count - 1)
                _index = 0;

            var element = root.Children[_index] as MediaElement;
            element.Source = new Uri(address, UriKind.Relative);
            element.Stop();
            element.Play();

            _index++;
        }


        public void PlayDrop()
        {
            Play("/Skrip;component/Resources/over.mp3");
        }


        public void PlayEat()
        {
            Play("/Skrip;component/Resources/eat.mp3");
        }

        public void PlaySkin()
        {
            Play("/Skrip;component/Resources/skin.mp3");
        }

        public void PlayOver()
        {
            Play("/Skrip;component/Resources/over.mp3");
        }

}

then i describe it in Main.xaml

behind Main.xaml.cs I call  PlayDrop(), PlayEat(), PlaySkin(), PlayOver(), when some action on going. But it's not working.. how to fix it.?

and I create some action with usercontrol main.xaml, in this main.xaml.cs I create Boolean to give Enabled = false (the coding behind isnot running/Stop), and Enabled = true (the coding behind it is running)..=>> (Stop and Play the action in main.xaml). In center action I call other usercontrol and name it soal.xaml

I stop main.xaml : main.Enabled = false, then call soal.xaml, => i doit with "if"

then when soal.xaml visibility is collapsed, main.xaml is start again. main.enabled = true. continuing the previous action. I can't coding it..

many thanks..