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_CBtaskIconUClick
Define a callback function on unclick event.

ObjIcon _CBtaskIconUClick (
ObjIcon _taskicon_
fun [ObjIcon u0 I] u1 _callback_
u0 _user_
)
Parameters

_taskicon_
any taskicon.
_callback_
callback function on unclick event (supplemental parameter is button number).
_user_
user parameter
Return value

same taskicon