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_DLGrflmessage
Define the callback function on answer event : it is called when the Message Box is closed.

MessageBox _DLGrflmessage (
MessageBox _messagebox_
fun [MessageBox u0 I] u1 _callback_
u0 _user_
)
Parameters

_messagebox_
any message box
_callback_
callback function on answer event (supplemental parameter is 1 is answer is Ok or Yes, 0 if answer is Cancel or No)
_user_
user parameter
Return value

same message box.