HDN_ITEMCHANGING


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HDN_ITEMCHANGING
HDN_ITEMCHANGING 
    phdr = (LPNMHEADER) lParam; 
Notifies a header control's parent window that the attributes of a header item are about to change. This notification message is sent in the form of a WM_NOTIFY message.
Returns FALSE to allow the changes, or TRUE to prevent them.

phdr
Address of an NMHEADER structure that contains information about the header control and the header item, including the attributes that are about to change.

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