public IPackageSource Add(string name, Uri uri)
        {
            var source = new MockPackageSource(name, uri);

            all.Add(source);
            RaiseChanged();
            return(source);
        }
        public IPackageSource Save()
        {
            var source = new MockPackageSource(name, uri);

            service.all.Add(source);
            service.RaiseChanged();
            return(source);
        }