Did you try $P17=menufile.menugroup in the code?
This will make it "shine".
You could also use $P+17=+menufile.menugroup to push the other menus over.
example:
(command"menuload""S:/cad/AutoCAD/Menus/PESVBL.mns");^C^C^C$P+15=+PESVBL.ONOFF
Hope this helps!