Where can I find BindeableBase. I tried nuget, I tried various ways of referencing it. I cant find it nowhere. I got as far as https://msdn.microsoft.com/en-us/library/microsoft.practices.prism.mvvm.bindablebase(v=pandp.50).aspx I am trying to implement this tuturial: https://www.tutorialspoint.com/mvvm/mvvm_validations.htm In this article BindableBase is being used, but cant get it i.....