AjaxControlToolkit.TabContainer.SaveControlState C# (CSharp) Method

        protected override object SaveControlState()
        {
            // Saving last active tab index
            this.LastActiveTabIndex = this.ActiveTabIndex;

            var pair = new Pair();
            pair.First = base.SaveControlState();
            pair.Second = ActiveTabIndex;
            if(pair.First == null && pair.Second == null)
                return null;

            return pair;
        }