simply stored by the control but not used in any way by it, or typed
pointers (wxClientData*) which are owned by the control meaning that the
typed client data (and only it) will be deleted when an item is deleted
simply stored by the control but not used in any way by it, or typed
pointers (wxClientData*) which are owned by the control meaning that the
typed client data (and only it) will be deleted when an item is deleted