CBN_DROPDOWN

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

Remarks

This notification message can occur only for a combo box with the CBS_DROPDOWN or CBS_DROPDOWNLIST style.

See Also

CBN_CLOSEUP, WM_COMMAND

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