Can't select same item twice on CollectionView

I use a CollectionView control to display a list of files, if users click an item a popup appears displaying information about the file and a button to download it, the problem is that i use the SelectionChanged method of the CollectionView to run this action, but if users close the popup and click again on the same item nothing happens. Back when we use ListView control, the ItemTapped event runs every time the users click the same item, but i need to changed to CollectionView because later we'll change the file item from a single row to multiple columns (2 or 3).

It is possible to make the users click on the same item multiple times ?

P.D: also try to set the SelectedItem to null but the app crashes if the users select the same item.