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

OpenBox _DLGrflopen (
OpenBox _openfile_
fun [OpenBox u0 P u1] _callback_
u0 _user_
)
Parameters

_openfile_
any open single-file selection box.
_callback_
callback function on selection event (supplemental parameter is the selected file)
_user_
user parameter
Return value

same selection box