title: VisualStateManager is not supported in a WPF project
body: <p>I'm using <code>&lt;VisualStateManager&gt;</code> in my xaml and it returns "VisualStateManger is not supported in a WPF project". I wonder that is it I need to install WPF Toolkit to enable it? Or I need to put a specific xlmns for xaml? By the way, I'm using visual studio 2013 and .NET Framework 4.5.</p>