TVN_SELCHANGING


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TVN_SELCHANGING
TVN_SELCHANGING 
    pnmtv = (LPNMTREEVIEW) lParam 
Notifies a tree view control's parent window that the selection is about to change from one item to another. This notification message is sent in the form of a WM_NOTIFY message.
Returns TRUE to prevent the selection from changing.

pnmtv
Address of an NMTREEVIEW structure. The itemOld and itemNew members contain valid information about the currently selected item and the newly selected item. The action member indicates whether a mouse or keyboard action is causing the selection to change. For a list of possible values, see the description of the TVN_SELCHANGED notification message.

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