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Hi, we're struggling with a real issue at the moment since upgrading to Q2 2012.
We have several RadButtons which have Command bindings to their view model, using the Prism 4 DelegateCommand with execute / canexecute methods.
When commands need to be updated, we call RaiseCanExecuteChanged() on each command.
The problem we're experiencing is that once the buttons have been disabled, we simply can't get them to re-enable again, even though the can execute methods are returning true every time they are called.
However if I use the normal Silverlight button, then everything works as expected.
Unfortunately I can't repro this problem with a simple sandbox application, which isn't much help to you I know.
This worked for us in previous releases with the RadButton, so something has definitely broken with this new release, and I would urge Telerik to look for ways in which the new RadButton source may not always work correctly.
We're working around the problem by not using the commanding pattern, falling back to Click / IsEnabled combo, which is more verbose and not very MVVM but at least it works.
Please let me know if you have any information on this matter or if there are other things that I could check.
Thanks,
Sam