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UserControlBehavior is built with an older version of the Blend SDK
"The type 'UserControlBehavior' from assembly 'Catel.MVVM' is built with an older version of the Blend SDK, and is not supported in a Windows Presentation Framework 4 project."
I see this error in VS2012 on WPF .NET 4.5 project. In spite of this project is build without any errors.
The same issue with KeyTrigger, UpdateBindingOnPasswordChanged.