The CBN_DROPDOWN notification message is sent when the list box of a combo box is about to be made visible. The parent window of the combo box receives this notification message through the WM_COMMAND message.
CBN_DROPDOWN idComboBox = (int) LOWORD(wParam); // identifier of combo box hwndComboBox = (HWND) lParam; // handle of combo box
This notification message can occur only for a combo box with the CBS_DROPDOWN or CBS_DROPDOWNLIST style.
|file: /Techref/os/win/api/win32/mess/src/msg02_16.htm, 1KB, , updated: 2000/4/7 12:19, local time: 2022/8/17 21:48,
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