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_CBwinUnclick
Define a callback on unclick event. The unclick event should always received by the window which received the corresponding click event, even if the cursor is not over the window any more. However, on Windows, some unclick events can be lost.

ObjWin _CBwinUnclick (
ObjWin _win_
fun [ObjWin u0 I I I] u1 _callback_
u0 _user_
)
Parameters

_win_
any window
_callback_
callback on unclick event (supplemental parameters are x,y coordinates and button number)
_user_
user parameter
Return value

same window