[PRISM] Retrieve data when tab page is active (tabbed page)

Hi all.

Does anyone know how to detect when a tab page is active?
In my case, I need to update my ObservableCollection when user access the tab page.

I followed the example of the page below, but for some reason, it didn't work for me.
https://github.com/qmatteoq/XamarinForms-Prism/blob/master/TabbedSample/TabbedSample/TabbedSample/ViewModels/ShowsListPageViewModel.cs

I also tried OnNavigateTo, but of course, it didn't work because it isn't even a navigation page.

Thank you all!