With the official release of the picker controls (in R2 2020) we refactored their internal structure in a way that some
valuable features to be shared among ListPicker, TemplatedPicker, DateTime
Basically, you would need to modify setting these properties like this:
(_listPicker.SelectorSettings as PickerPopupSelectorSettings).AcceptButtonText = "OK";
Let me know if you have any additional questions or concerns related to ListPicker.
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