TVN_ITEMEXPANDED


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TVN_ITEMEXPANDED
TVN_ITEMEXPANDED 
    pnmtv = (LPNMTREEVIEW) lParam 
Notifies a tree view control's parent window that a parent item's list of child items has expanded or collapsed. This notification message is sent in the form of a WM_NOTIFY message.
The return value is ignored.

pnmtv
Address of an NMTREEVIEW structure. The itemNew member is a TVITEM structure that contains valid information about the parent item in the hItem, state, and lParam members. The action member indicates whether the list expanded or collapsed. For a list of possible values, see the description of the TVM_EXPAND message.

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