Would you please shed some more light on your scenario? Are you using autogenerated fields, or custom DataTemplates? If it is the latter option, have set bindings' properties ValidatesOnExceptions and NotifyOnDataErrors to true? As we have never encountered such an issue with RadDataForm, it would very difficult for us to reproduce it by having such limited information. Would you please send us a small running project that reproduces this unwanted behavior?
the Telerik team
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