Thank you for contacting us.
You can use the SelectedItems collection to programmatically select items. I have attached a sample that demonstrates this. Unfortunately, this will work on iOS only because we have an issue
on Android where the selection is not properly updated when we modify the SelectedItems collection. I have raised the priority of the issue and the fix should be available in the next internal build.
You mentioned that the ItemTapped event does not always work on iOS, but I couldn't reproduce this issue. It could be something that is specific to your setup, could you please send us an example?
I look forward to your reply.
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