Stacking files in custom home items

I have created a custom home item for my daughter that opens a favourite, which is in fact is pointing at a specific folder with her movies in it.

All files show up and with a little bit of manual work I get everything to show as I want it except one thing - I can not stack two .avi-files. They show as two seperate files regardless of which view I use. The files stack perfectly fine in the ordinary "Movies"-home item.

Is there a way for me to stack the files in the custom home item as well?