private void prepareCommand()
 {
     readTextRoutedCommand = new RoutedCommand("ReadTextRoutedCommand", typeof(MemorizeGrid));
     CommandManager.RegisterClassCommandBinding(typeof(MemorizeGrid),
                                                new CommandBinding(readTextRoutedCommand, (s, e) =>
     {
         if (e.Source is Button)
         {
             Button btn = e.Source as Button;
             if (btn.DataContext is MemorizeReadText)
             {
                 SpeechHelper.Instance.CancelSpeakAsync();
                 MemorizeReadText readText = this.openedButton1.DataContext as MemorizeReadText;
                 SpeechHelper.Instance.SpeakAsync(readText.Text, -4);
             }
         }
     }));
 }
        private void setButtonStyle(Button btn)
        {
            MemorizeObject obj = btn.Tag as MemorizeObject;

            if (btn.Tag is MemorizeReadText)
            {
                btn.Style = this.AudioButtonStyle;

                MemorizeReadText memorizeReadText = btn.Tag as MemorizeReadText;

                SpeechHelper.Instance.SpeakAsync(memorizeReadText.Text, -3);
            }
            else if (btn.Tag is MemorizeText)
            {
                btn.Style = this.TextButtonStyle;
            }
            else if (btn.Tag is MemorizeImage)
            {
                MemorizeImage memorizeImage = btn.Tag as MemorizeImage;
                if (memorizeImage.Count >= 0)
                {
                    int imageWidth = (int)(this.itemWidth / 4f);
                    memorizeImage.GenerateItems(0, (this.itemHeight - this.itemWidth) / 2,
                                                this.itemWidth - imageWidth, this.itemWidth - imageWidth,
                                                imageWidth);
                    btn.Style = this.ImageButtonStyle;
                }
                else
                {
                    btn.Style = this.ImageButtonNoRepeatStyle;
                }
            }
            else if (btn.Tag is MemorizeMusic)
            {
                btn.Style = this.AudioButtonStyle;

                MemorizeMusic memorizeMusic = btn.Tag as MemorizeMusic;

                this.audioItemMediaPlayer.Stop();
                this.audioItemMediaPlayer.Close();
                this.audioItemMediaPlayer.Open(new Uri(memorizeMusic.Url, UriKind.Absolute));
                this.audioItemMediaPlayer.Play();
            }
        }