Could you please clarify how exactly you're handling the SelectionChanged event at the moment? I tested the behavior you described with the Selection Range and Constraints
demo from our WPF Controls Demos
as I believe this is the one you were refering to and the single selection works as expected at my end. If you had another demo in mind, please let me know.
Ideally, would it be possible for you to share the whole code of your current implementation so that I can reproduce the issue at my end and assist you further?
I look forward to your reply.
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