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CBN_DROPDOWN notification code

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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 code through the WM_COMMAND message.

CBN_DROPDOWN

    WPARAM wParam;
    LPARAM lParam;

Parameters

wParam

The LOWORD contains the control identifier of the combo box. The HIWORD specifies the notification code.

lParam

Handle to the combo box.

Remarks

This notification code is only sent if the combo box has the CBS_DROPDOWN or CBS_DROPDOWNLIST style.

Requirements

Requirement Value
Minimum supported client
 Windows Vista [desktop apps only]
Minimum supported server
 Windows Server 2003 [desktop apps only]
Header
Winuser.h (include Windows.h)

See also

Reference

CBN_CLOSEUP

Other Resources

HIWORD

LOWORD

WM_COMMAND