MSDN..


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TV1.Add(relative, relationship, key, text, image, selectedimage)

tvwFirst 0 First. The Node is placed before all other nodes at the same level of the node named in relative.
tvwLast 1 Last. The Node is placed after all other nodes at the same level of the node named in relative. Any Node added subsequently may be placed after one added as Last.
tvwNext 2 (Default) Next. The Node is placed after the node named in relative.
tvwPrevious 3 Previous. The Node is placed before the node named in relative.
tvwChild 4 Child. The Node becomes a child node of the node named in relative.

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