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HDN_TRACK

HDN_TRACK 
    phdr = (LPNMHEADER) lParam; 

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

• Returns FALSE to continue tracking the divider, or TRUE to end tracking.

phdr

Address of an NMHEADER structure that contains information about the header control and the item whose divider is being dragged.

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