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TVN_ITEMEXPANDING

TVN_ITEMEXPANDING 
    pnmtv = (LPNMTREEVIEW) lParam 

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.

• Returns TRUE to prevent the list from expanding or collapsing.

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 is to expand or collapse. For a list of possible values, see the description of the TVM_EXPAND message.

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