I’m trying to create different tile sizes for the first item in each group of the GroupedItemsPage template with the data template selector. Is there a way to get the group index and the item index within the group for each item? If not, is the only way to use custom properties of the item?
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The quick answer is no. Add an index property to your model.
http://blog.jerrynixon.com/2012/08/windows-8-beauty-tip-using.html