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Sets a callback corresponding to the mouse click event.

CompCheck _CBcompCheckClick ( CompCheck _check_ fun [CompCheck u0 I I I I] u1 _callback_ u0 _user_ )

_check_
	any CompCheck
_callback_
	callback function on mouse click (supplemental parameters are x, y, btn and mask) x and y are cursor coordinates in container 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