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Defines a user callback on a click event in the container

ObjContainer _CBcontainerClick ( ObjContainer _container_ fun [ObjContainer u0 I I I I] u1 _callback_ u0 param )

_container_
	any ObjContainer
_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
param
	user parameter