HDN_ITEMCLICKHDN_ITEMCLICK*
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HDN_ITEMCLICK


HDN_ITEMCLICK 
    phdr = (LPNMHEADER) lParam;

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

phdr
Address of an NMHEADER structure that identifies the header control and specifies the index of the header item that was clicked and the mouse button used to click the item. The pItem member is set to NULL.

A header control sends this notification message after the user releases the left mouse button.

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