The TVN_ITEMEXPANDING notification message notifies a tree-view control’s parent window that a parent item’s list of child items is about to expand or collapse. This notification message is sent in the form of a WM_NOTIFY message.
TVN_ITEMEXPANDING pnmtv = (NM_TREEVIEW FAR *) lParam
Returns TRUE to prevent the list from expanding or collapsing.
NM_TREEVIEW, TV_ITEM, TVM_EXPAND, WM_NOTIFY
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