To better indicate the real issue, could you please elaborate more on your scenario ?
- Do you use the MaskedTextInput in ItemEditTemplate or simply ItemTemplate ? Could you please send us the XAML of the template used?
- Is your TreeView editable ?
- On which event do you perform the focusing code ? Does this code work on a simple Button CLick ?
Actually you can take advantage of our 24h priority support by sending a support ticket. You will be able to attach a reproducible isolated project that we can investigate better.
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