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NM_CLICK (tree view)

NM_CLICK 
    lpnmh = (LPNMHDR) lParam; 

Notifies a tree view control's parent window that the user has clicked the left mouse button within the control. This notification is sent in the form of a WM_NOTIFY message.

• Return nonzero to prevent the default processing, or zero to allow the default processing.

lpnmh

Address of an NMHDR structure that contains additional information about this notification message.

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