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DTN_DROPDOWN

DTN_DROPDOWN
    lpNmhdr = (LPNMHDR)lParam;

Sent by a date and time picker (DTP) control when the user activates the drop-down month calendar.

• The return value for this notification is not used.

lpNmhdr

Address of an NMHDR structure that contains information about the notification message.

DTP controls do not maintain a static child month calendar control. The DTP control creates a new month calendar control before sending this notification message. Additionally, the DTP control destroys the child control when it is not active (visible). So your application must not rely on a static window handle for the control's child month calendar.

Version 4.70

See also DTN_CLOSEUP, DTM_GETMONTHCAL

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