VS2010: you also need Portable Library Tools 2
VS2012: the portable library may have some issues with the XAML designer view (this was solved with update 3, but seems to have reappeared)
VS2013: recommended version!
VS2012: the portable library may have some issues with the XAML designer view (this was solved with update 3, but seems to have reappeared)
VS2013: recommended version!