CallMethodAction: can it be used in WPF?

Apr 25, 2013 at 6:55 PM
When i use CallMethodAction in MVVM-WPF i get this error: "CallMethodAction" does not exist in the namespace "".

knowing that i include the following namespaces in my xaml:
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" xmlns:ei=""

And if it is for SL only, what is the equivalent in WPF