Where is Microsoft.Expression.Interactions?
Is your project missing a reference to Microsoft.Expression.Interactions or System.Windows.Interactivity?
Download and install the Microsoft Expression Blend SDK for Silverlight 4. It’s in there.
Is your project missing a reference to Microsoft.Expression.Interactions or System.Windows.Interactivity?
Download and install the Microsoft Expression Blend SDK for Silverlight 4. It’s in there.