We have not implemented this feature yet. However, there is an easy workaround that you can use. If you specify the MinimizedHeight of each tile to be equal to the height of an item's header, then you will get the desired effect. If you data bind the control, you can specify the height in a dedicated style and set the TileView.ItemContainerStyle property to that style.
Let me know if the proposed workaround will work for you.
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