This 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.
At a Glance
| Header file: | Winuser.h |
| Windows CE versions: | 1.0 and later |
Syntax
CBN_DROPDOWN idComboBox = (int)LOWORD(wParam);
hwndComboBox = (HWND) lParam;
Parameters
idComboBox
Identifier of the combo box.
hwndComboBox
Handle to the combo box.
Remarks
This notification message can occur only for a combo box with the CBS_DROPDOWN or CBS_DROPDOWNLIST style.
See Also