Our own Demo application, which uses some validation logic for a data field, has been approved by the App Store team without any issues. Here is the app for your reference: https://itunes.apple.com/bg/app/telerik-ui-examples/id785438612?mt=8
I would suggest that you contact the App Store team and explain that validationMessage is not a private method of theirs. We have not received complaints before and we were not aware it existed.
Some good news regardless of what the App Store team would say - this week we plan to release a new version where the validationMessage property is removed in favor of two new properties - positiveMessage and errorMessage. This will give more flexibility over the validation logic.
In case you are using the DataForm in your application, I would like to let you know that the DataForm has been in Beta in 2015.2.624, so at that time it was not intended for app deployment purposes. It is now official and its API has been much improved, which however brings some API changes. Yоu can update to the upcoming version, once we release it, and follow the Release Notes
which will help you update your DataForm API usage. You can subscribe to the Release Notes RSS
which will notify you once the new version is out.
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