CommandBarComboBox fill items dynamically

Using the standard Windows API constrols (not COM/VB), you can clear and fill the combo when you receive the CBN_DROPDOWN (7) notification.

Notifications for standard controls are in the Windows.h file for C/C++; i.e.,

#define CBN_ERRSPACE        (-1)
#define CBN_SELCHANGE       1
#define CBN_DBLCLK          2
#define CBN_SETFOCUS        3
#define CBN_KILLFOCUS       4
#define CBN_EDITCHANGE      5
#define CBN_EDITUPDATE      6
#define CBN_DROPDOWN        7
#define CBN_CLOSEUP         8
#define CBN_SELENDOK        9
#define CBN_SELENDCANCEL    10

I would think there would be a similar defines/enumeration for VB.