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[WPF] ItemsControl : how to do hittest to find item / index under mouse position ?

In my Canvas I have children with a specific design which includes an ItemsControl. In the OnPreviewLeftMouseButtonDown handler of my canvas, I perform a hittest using VisualTreeHelper, and when I find a specific ItemsControl I'd like to know which item / item-index the mouse was over.

Does anybody know how to do this ?

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