Aplikacja z ListView na siłownie

Witam serdecznie. Piszę aplikację sklepu windows na Windows 8.1 Phone. Natknąłem się na problem:

<Page.BottomAppBar>
        <CommandBar>
            <AppBarButton x:Name="ButtonPanel_Add" Icon="Add" Label="Dodaj" Click="ButtonPanel_Add_Click"/>
        </CommandBar>
    </Page.BottomAppBar>

    <Grid>
        <ListView x:Name="listView" HorizontalAlignment="Center" Height="384" VerticalAlignment="Top" Width="504" Margin="10,0">
            <ListView.ItemTemplate>
                <DataTemplate>
                <StackPanel Name="PanelUI" Height="80" Orientation="Horizontal" HorizontalAlignment="Center" UseLayoutRounding="True" Tapped="SeriesPanelUI_Tapped" Holding="PanelUI_Holding">
                    <Border Height="40" Width="40" Margin="0,0,0,0">
                        <Image Name="Image_Exercise" Height="40" Width="40"/>
                    </Border>
                    <StackPanel Orientation="Vertical" VerticalAlignment="Center" Margin="0,0,0,0" HorizontalAlignment="Center">
                            <Button Content="Wybierz" x:Name="Button_Exercise" Margin="10,0,0,0" Width="180" FontSize="18" HorizontalAlignment="Center" VerticalAlignment="Center" Loaded="Button_Exercise_Loaded">
                                <Button.Background>
                                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                        <GradientStop Color="Black" Offset="0"/>
                                        <GradientStop Color="White" Offset="1"/>
                                    </LinearGradientBrush>
                                </Button.Background>
                                <Button.Flyout>
                                    <MenuFlyout>
                                    </MenuFlyout>
                                </Button.Flyout>
                            </Button>
                        </StackPanel>
                    <StackPanel Orientation="Vertical" VerticalAlignment="Top" Margin="0,0,0,0" HorizontalAlignment="Center">
                        <AppBarButton Icon="Add" Name="Button_Plus" Height="60" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0,10,0,0" Click="Button_Plus_Click"/>
                    </StackPanel>
                    <StackPanel Orientation="Vertical" VerticalAlignment="Top" Margin="0,0,0,0" HorizontalAlignment="Center">
                        <AppBarButton Icon="Remove" Name="Button_Minus" Height="60" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0,10,0,0" Click="Button_Minus_Click"/>
                    </StackPanel>
                    <StackPanel Orientation="Vertical" VerticalAlignment="Top" Margin="0,0,0,0" HorizontalAlignment="Center">
                        <TextBlock Name="textBlock_Count" Text="0" TextWrapping="Wrap" Width="100" FontSize="40" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10,10,0,0"/>
                    </StackPanel>
                </StackPanel>
            </DataTemplate>
                </ListView.ItemTemplate>
        </ListView>
    </Grid>
</Page>

       protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            DisplayInformation.AutoRotationPreferences = DisplayOrientations.Landscape;

        }
        public T FindElementByName<T>(DependencyObject element, string sChildName) where T : FrameworkElement
        {
            T childElement = null;
            var nChildCount = VisualTreeHelper.GetChildrenCount(element);
            for (int i = 0; i < nChildCount; i++)
            {
                FrameworkElement child = VisualTreeHelper.GetChild(element, i) as FrameworkElement;

                if (child == null)
                    continue;

                if (child is T && child.Name.Equals(sChildName))
                {
                    childElement = (T)child;
                    break;
                }

                childElement = FindElementByName<T>(child, sChildName);

                if (childElement != null)
                    break;
            }
            return childElement;
        }

private async void Button_Exercise_Loaded(object sender, RoutedEventArgs e)
        {
            Button Button_Exercise = FindElementByName<Button>(listView, "Button_Exercise");
            
            MenuFlyout mn = new MenuFlyout();

            Button_Exercise.Flyout = mn;

            var Loading = new File();
            var Content = await Loading.LoadLocal("ExercisesList.Se");

            if (Content == "0") { Content = "[]"; }
            if (Content == string.Empty) { Content = "[]"; }
            if (Content == null) { Content = "[]"; }

            var loaded = JsonConvert.DeserializeObject<IEnumerable<DataSource>>(Content);
            foreach (var item in loaded)
            {
                var flyoutItem = new MenuFlyoutItem();
                flyoutItem.Text = item._Nazwa;
                flyoutItem.Name = item._Image;
                mn.Items.Add(flyoutItem);

                flyoutItem.Click += new RoutedEventHandler(FlyoutItem_Click);
            }
        }

private void FlyoutItem_Click(object sender, RoutedEventArgs e)
        {
            Button Button_Exercise = FindElementByName<Button>(listView, "Button_Exercise");
            Image Image_Exercise = FindElementByName<Image>(listView, "Image_Exercise");

            MenuFlyoutItem flyoutItem = sender as MenuFlyoutItem;
            if (flyoutItem != null)
            {
                var Clicked = flyoutItem.Text;
                Button_Exercise.Content = Clicked;                               
            }

            var Img = flyoutItem.Name;

            var Path = string.Empty;

            switch(Img)
            {
                case "1":
                    Path = "ms-appx:///Assets/1.png";
                    break;
                case "2":
                    Path = "ms-appx:///Assets/2.png";
                    break;
                case "3":
                    Path = "ms-appx:///Assets/3.png";
                    break;
                case "4":
                    Path = "ms-appx:///Assets/4.png";
                    break;
                case "5":
                    Path = "ms-appx:///Assets/5.png";
                    break;
                case "6":
                    Path = "ms-appx:///Assets/6.png";
                    break;
                default:                    
                    Path = "ms-appx:///Assets/1.png";
                    break;
            }

            BitmapImage bitmapImage = new BitmapImage();
            bitmapImage.UriSource = new Uri(Path);
            Image_Exercise.Source = bitmapImage;
        }


 private void Button_Plus_Click(object sender, RoutedEventArgs e)
        {
            TextBlock textBlock_Count = FindElementByName<TextBlock>(listView, "textBlock_Count");

            var CounterText = textBlock_Count.Text;
            var ParsingText = float.Parse(CounterText);
            var Counter = ParsingText;
            Counter = Counter + 1;
            if (Counter < 0) { Counter = 0; }
            textBlock_Count.Text = Counter.ToString();
        }

        private void Button_Minus_Click(object sender, RoutedEventArgs e)
        {
            TextBlock textBlock_Count = FindElementByName<TextBlock>(listView, "textBlock_Count");

            var CounterText = textBlock_Count.Text;
            var ParsingText = float.Parse(CounterText);
            var Counter = ParsingText;
            Counter = Counter - 1;
            if (Counter < 0) { Counter = 0; }
            textBlock_Count.Text = Counter.ToString();
        }



 private void ButtonPanel_Add_Click(object sender, RoutedEventArgs e)
        {           
            object EX = string.Empty;           
            listView.Items.Add(EX);
        }

A więc sprawa wygląda tak. Ma to być aplikacja licząca powtórzenia na siłowni.
Aplikacja działa tak że po kliknięciu na przycisk ButtonPanel_Add dodaje się pozycja w listView określona w ListView DataTemplate. Ma to być dana seria ćwiczenia.
Zrobiłem prowizoryczny licznik powtórzeń który dodaje i odejmuje po wciśnięciu + i -. Po wciśnięcu buttona Button_Exercise "Wybierz" wyświetla się lista ćwiczeń w MenuFlyout przygotowana już wcześniej . Wszystko działa w przypadku jednej pozycji (zdjęcie powyżej). Ale gdy dodaje kilka serii (Zdjęcie poniżej) działa to tylko dla pierwszej utworzonej serii. Po wciśnięciu przycisku + w czwartej serii dodaje się na licznik pierwszej serii. Teraz moja prośba do was. Co muszę zrobić aby każda seria była nie zależna od siebie?