private void CNlist_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            myModel previous = (e.PreviousSelection.FirstOrDefault() as myModel);
            myModel current  = (e.CurrentSelection.FirstOrDefault() as myModel);

            //Set the current to the color you want
            current.FirstFrameBackColor  = Color.Pink;
            current.SecondFrameBackColor = Color.Green;

            if (previous != null)
            {
                //Reset the previous to defaulr color
                previous.FirstFrameBackColor  = Color.White;
                previous.SecondFrameBackColor = Color.Purple;
            }
        }
        public MainPage()
        {
            InitializeComponent();

            myModel model1 = new myModel()
            {
                FirstFrameBackColor = Color.White, SecondFrameBackColor = Color.Purple
            };
            myModel model2 = new myModel()
            {
                FirstFrameBackColor = Color.White, SecondFrameBackColor = Color.Purple
            };
            myModel model3 = new myModel()
            {
                FirstFrameBackColor = Color.White, SecondFrameBackColor = Color.Purple
            };
            myModel model4 = new myModel()
            {
                FirstFrameBackColor = Color.White, SecondFrameBackColor = Color.Purple
            };
            myModel model5 = new myModel()
            {
                FirstFrameBackColor = Color.White, SecondFrameBackColor = Color.Purple
            };
            myModel model6 = new myModel()
            {
                FirstFrameBackColor = Color.White, SecondFrameBackColor = Color.Purple
            };
            myModel model7 = new myModel()
            {
                FirstFrameBackColor = Color.White, SecondFrameBackColor = Color.Purple
            };

            models.Add(model1);
            models.Add(model2);
            models.Add(model3);
            models.Add(model4);
            models.Add(model5);
            models.Add(model6);
            models.Add(model7);

            CNlist.ItemsSource = models;
        }