I've added the following to my S:TARTUP and it keeps the button on.
(setq regProfRoot (strcat "HKEY_CURRENT_USER\\" (vlax-Product-Key) "file://profiles//" (getvar "CProfile")))
(setq RegNow (strcat regProfRoot "file://statusbar//Application"))
(vl-registry-write RegNow "Paper/ModelPane" 1);turn on the model/paper status bar
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