gistfile1.txt

        public IRegion Initialize(T regionTarget, string regionName)
        {
            if (regionName == null)
                throw new ArgumentNullException(nameof(regionName));

            IRegion region = this.CreateRegion();
            region.Name = regionName;

            SetObservableRegionOnHostingControl(region, regionTarget);

            this.Adapt(region, regionTarget);
            this.AttachBehaviors(region, regionTarget);
            this.AttachDefaultBehaviors(region, regionTarget);
            return region;
        }