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Sets a callback corresponding to a node opening or closing in tree view.

CompTree _CBcompTreeStateChanged ( CompTree _tree_ fun [CompTree u0 [I r1] I] u1 _callback_ u0 _user_ )

_tree_
	any CompTree
_callback_
	callback function on opening or closing a node (supplemental parameters are position and state) position where nil is root element, 0::nil is first son of root element, 1::nil is second son of root element, etc.. state is one of the values : Value Meaning TRE_SHRINK node has just been closed TRE_EXPAND node has just been opened
_user_
	user parameter