HDN_ITEMDBLCLICKHDN_ITEMDBLCLICK*
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HDN_ITEMDBLCLICK


HDN_ITEMDBLCLICK 
    pnmhdr = (LPNMHEADER) lParam;

Notifies a header control's parent window that the user double-clicked the control. This notification message is sent in the form of a WM_NOTIFY message. Only header controls that are set to the HDS_BUTTONS style send this notification.

pnmhdr
Address of an NMHEADER structure that contains information about this notification.

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