gistfile1.txt

        public object LoadContent(IRegion region, NavigationContext navigationContext)
        {
            if (region == null)
                throw new ArgumentNullException(nameof(region));

            if (navigationContext == null)
                throw new ArgumentNullException(nameof(navigationContext));

            string candidateTargetContract = this.GetContractFromNavigationContext(navigationContext);

            var candidates = this.GetCandidatesFromRegion(region, candidateTargetContract);

            var acceptingCandidates =
                candidates.Where(
                    v =>
                    {
                        var navigationAware = v as INavigationAware;
                        if (navigationAware != null && !navigationAware.IsNavigationTarget(navigationContext))
                        {
                            return false;
                        }

                        var frameworkElement = v as FrameworkElement;
                        if (frameworkElement == null)
                        {
                            return true;
                        }

                        navigationAware = frameworkElement.DataContext as INavigationAware;
                        return navigationAware == null || navigationAware.IsNavigationTarget(navigationContext);
                    });


            var view = acceptingCandidates.FirstOrDefault();

            if (view != null)
            {
                return view;
            }

            view = this.CreateNewRegionItem(candidateTargetContract);

            region.Add(view);

            return view;
        }