I don't know how to do it with a command line switch either, but with the pragmas I noted this will suppress the message for the specific section of effected code. Depending on code organization this can be a hassle to add, but does this not do what you want?
#pragma WARNINGLEVEL = 1
ACTIVATE DIALOG oDlg;
ON INIT MSGINFO();
CENTER
#pragma WARNINGLEVEL = 3
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