Wpf listview and textboxes

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WPF

ListView

I have a WPF DataGrid that uses a ListView with 3 columns. The second column can have 1 or more items associated with the first column item. I am able to capture the item index of the first column but when clicking in one of the associated textboxes to edit I am unable to get the index of the textbox.

Any examples or ideas would be greatly appreciated.

What I have tried:

I have tried multiple mouse events to capture the selected item index but am unable to get the index.