You have to use the PreviewTileStateChanged, PreviewTilePositionChanged changed events, store (reference) the item that have to be repositioned to Position 0, and attach / detach PreviewTilePositionChaged event. The main idea is as follows - you are going to maximize item with Position 10, so you have to update every item's Position from (Position 1 to Position 9) and increase it with 1.
Then you have to Set the "ItemToBeMiniMized" Position to 0.
All the best,
the Telerik team
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