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_DLGrflopenMulti
Define a callback function on selection event : it is called when the user has selected files.

OpenBoxMulti _DLGrflopenMulti (
OpenBox _openfile_
fun [OpenBoxMulti u0 [P r1]] u1 _callback_
u0 _user_
)
Parameters

_openfile_
any open multiple-file selection box.
_callback_
callback function on selection event (supplemental parameter is list of selected files)
_user_
user parameter
Return value

same selection box