AspNetEdit.UI.PropertyEditors.CollectionEditor.downButton_Clicked C# (CSharp) Method

        void downButton_Clicked(object sender, EventArgs e)
        {
            TreeIter iter, next;
            TreeModel model;
            if (!itemTree.Selection.GetSelected(out model, out iter))
                return;

            //get next iter
            next = iter.Copy();
            if (!itemStore.IterNext (ref next))
                return;

            //swap the two
            itemStore.Swap (iter, next);

            //swap indices too
            object nextVal = itemStore.GetValue (next, 1);
            object iterVal = itemStore.GetValue (iter, 1);
            itemStore.SetValue (next, 1, iterVal);
            itemStore.SetValue (iter, 1, nextVal);
        }