Listview item tapped in xamarin.forms

I'm trying to developp an App in Xamarin.Forms and XAML, and I need to capture an event when I tap on a LV. What I want the app to do is change the color of the Cell (or a StackLayout inside the cell) when the user tap on the Item on a list. I'm trying to implement the OnItemTapped property on the listview, but nothing happens when I press the Item. My code is quite simple:

Model: Product with 2 propeties, name and color.

public class Product: INotifyPropertyChanged
    {
        #region INotifyPropertyChanged implementation

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion

        public Product ()
        {
        }

        public string Name { get; set; }
        public bool Buy { get; set; }
        public  Color micolor { get; set; }

        //Método para actualizar los cambios
        protected virtual void OnPropertyChanged (string propertyName)
        {
            if (PropertyChanged == null)
                return;

            PropertyChanged (this, new PropertyChangedEventArgs (propertyName));
        }
    }

XAML: Only a list with two bindings: the name in a label, and the color in the SL

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="pruebalv.MyPage1">
    <ContentPage.Content>
     <ListView  x:Name="listView"
     ItemTapped="OmItemTapped"
     >

            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <StackLayout 
                        Orientation="Vertical"
                        BackgroundColor ="{Binding micolor}">
                                <Label Text="{Binding Name}"/>
                        </StackLayout>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </ContentPage.Content>
</ContentPage>

And behind .cs code: I create the products (it is only a sample) and implement the on item tapped. When item tapped, I want to change the color property of the item pressed.

public void OmItemTapped (object o, ItemTappedEventArgs e)
        {
            var dataItem = e.Item as Product;
            dataItem.micolor  = Color.Green;
            dataItem.Name  = "Tapped!!";

        }

The result that I get when I create a list is that nothing happens when I tap on an item.

Do am I missing something? As I've understood with the tutorials, only with the "itemtapped" roperty of the ListView, and the InotifyProperty... on the products, I'd see the results. Is it correct? Thanks!