ARCed.UI.DockPanel.FocusManagerImpl.AddLastToActiveList C# (CSharp) Method

            private void AddLastToActiveList(IDockContent content)
            {
                IDockContent last = this.LastActiveContent;
                if (last == content)
                    return;

                DockContentHandler handler = content.DockHandler;

                if (this.IsInActiveList(content))
                    this.RemoveFromActiveList(content);

                handler.PreviousActive = last;
                handler.NextActive = null;
                this.LastActiveContent = content;
                if (last != null)
                    last.DockHandler.NextActive = this.LastActiveContent;
            }