Not showing items with Visibility=Collapsed in Windows 8.1 GridView

Question

I have a Windows 8.1 application with a GridView bound to a custom (sortable, deduplicated) observable collection. In this collection, I do some heavy filtering

Answer 1

I tried your sample solution and changed it to a ListView instead. It exhibits the same behavior when the grid itself is hidden. I don't have XAML Spy to verify, but it appears that any List based control will allocate a rendered item for each item in the list.

I changed your click handlder to instead ds.RemoveAt(5); instead of hiding the item, and the element is removed from view with a nice animation. This appears to be as expected, and an interesting find.