Reordering list box items.

This question was asked by someone else before but there was no answer so I will ask it again:
I've implemented a WidgetListBoxWidgetN widget in a dialog and am trying to make it reorderable by the user dragging list items around in the list box. I figured that all I would need to do was set the 'list items can be reordered' flag in the resource definition for the list box and I would be all set. However, when I attempt to drag an item in the list box, the mouse pointer turns into an icon indicating that the item drag is not allowed.
I've looked through the user interface tutorial, the user interface guide, the html guide and this forum. I haven't been able to find anything that can point me in the right direction. What am I missing here?
Barry

Thanks for the answer Dirk,
No,
From the comment for the listbox setting "List items can be reordered" I assumed that setting this to kTrue would be all that is required. It is all internal to the widget so I didn't see why I should need to get involved.

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namespace skbtInstaller
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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