Does ObservableCollection.RemoveAt() do two selections?

Don't bind the selectedindex.

This is a bad idea.

Bind the selecteditem instead.

You then do

myObservableCollection.Remove(SelectedItem);

And you can put code in the setter which acts when the user chooses a different selection.

You don't need to use the index to find the item that is selected, because it is the selecteditem.

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