ListView + DataTemplate + Updating viewModel on ItemTapped => can't make the view updated

Hi everybody,

I would like to know if some of you succeeded with updating a ListView item, on ItemTapped.
For instance, i would like to change the label of the list item.
My viewModel is well updated, but my view is not.

I need to say that I don't use xaml, only *.cs

Thank you very much!