You can try implementing this functionality in your ViewModel. For example:
1. Bind CurrentItem property of RadDataForm to a property in the ViewModel;
2. Once this property is changed, you can verify its property value (containing the information for read-only mode of the item) and based on it to disable/enable a custom command defined in this ViewModel.
3. Bind the Command of the Edit-Button to this custom command in your ViewModel.
Will that scenario correspond to your needs ?
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