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HDN_DIVIDERDBLCLICK


HDN_DIVIDERDBLCLICK 
    phdn = (LPNMHEADER) lParam;

Notifies a header control's parent window that the user double-clicked the divider area of the control. This notification message is sent in the form of a WM_NOTIFY message.

phdn
Address of an NMHEADER structure that contains information about the header control and the item whose divider was double-clicked.

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