In addition to Set Methods, the class Tree has the following methods.
|After||This method queries the element following a given key.|
|Before||This method queries the element preceeding a given key.|
|ContainsKey||This method determines if a key resides in the tree.|
|Find||This method searches the tree for a given key.|
|GetObjectData||This method is used when serializing the tree.|
|Remove - Key||This method removes the entry with the specified key.|