ListView clean up issues

[pme442]

Hi.
I've spent several days trying to figure this out and I've not had much luck.
I have a page with a ListView whose ItemsSource is an ObservableCollection and uses a DataTemplateSelector. (I have 6 or 7 DataTemplates, each inherit from ViewCell).
As you can click on some buttons on the page, the ObservableCollection is cleared and then repopulated with different items, the UI reflects the changes and it all works perfectly fine.
The problem is: The more times the list is cleared and updated, the more leaks/zombies I get when I close the page. The leaks are coming from the DataTemplates of all of the items that were loaded and cleared since the page was opened.
I understand that I cannot add the TearDownBehavior to the DataTemplates because they are ViewCells, which are Elements, not VisualElements.
I've tried creating a CustomViewCell class and overriding OnDisappearing() and OnChildRemoved() to see if I could clean things up at either of those points, but that wasn't working.
Any thoughts or suggestions?