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Sets a callback corresponding to an item selection event.

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

_tree_
	any CompTree
_callback_
	callback function on user item selection (supplemental parameter are clicked item position, btn and mask) position where nil is root element, 0::nil is first son of root element, 1::nil is second son of root element, etc.. btn can be any of following values : Value Meaning LBUTTON left button is clicked MBUTTON middle button is clicked RBUTTON right button is clicked mask is a combination of values : Value Meaning MK_CONTROL control key is pressed MK_LBUTTON left button is pushed MK_MBUTTON middle button is pushed MK_RBUTTON right button is pushed MK_SHIFT shift key is pushed
_user_
	user parameter