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_CBcombo
Define a callback function on selection event.

ObjBox _CBcombo (
ObjBox _combo_
fun [ObjBox u0 I S] u1 _callback_
u0 _user_
)
Parameters

_combo_
any combo box
_callback_
callback function on selection (supplemental parameters are selection number and selection string)
_user_
user parameter
Return value

same combo box