I'm trying to get notification when the selection within a list of items in a selection box is changed.  For example, if I have 10 edges selected and they are all listed in my selection box, the user can click one of the 10 items listed in the box and they become highlighted.  However I cannot find a way to handle this.  I have set the style to swPropMgrPageSelectionBoxStyle_WantListboxSelectionChanged, but none of my notifications are being triggered.

Can anyone help?  What is the callback function that should be called?  Is it OnSubmitSelection or OnSelectionboxListChanged?

Thanks.