1) Unzip and open the attached attached file.

2) In MainPage.xaml, right-click on the ListBox on the Stage or in the Navigator.

3) From its ContextMenu, navigate to 'Templates', 'ItemContainer' -- then attempt to apply the [Default] Template.

4) Right-click on the ListBox again, and from its ContextMenu, navigate to 'Templates', 'ItemContainer'.
Observe how the [Default] Template was not successfully applied.

5) Close the application by pressing the [X] in the upper-right of the window.

Observe a crash occurring.

Note: If a crash did not occur, perform Step 2 two or three times before closing the application window.

Expected Results: The [Default] Template can be applied at any time.
Expected Results: Attempting to apply [ Default] Template doesn't result in the application closing on close.