//Remove UC element
        void dsc_RemoveItem(object sender, EventArgs e)
        {
            DetailsSelectorSubelementControl scnd = (DetailsSelectorSubelementControl)sender;

            ReturnedResults.Remove(scnd.ReturnResult);

            stcScnd.Children.Remove(scnd);
        }
        //adding new UC element
        private void btnAdd_Click(object sender, RoutedEventArgs e)
        {
            DetailsSelectorSubelementControl dsc = new DetailsSelectorSubelementControl();

            stcScnd.Children.Add(dsc);
            //ReturnedResults.Add(MainReturnedResult);
            ReturnedResults.Add(dsc.ReturnResult);

            dsc.RemoveItem += new EventHandler(dsc_RemoveItem);
        }