Problem with secondary home pages GPO

I am trying to set and LOCK the users homepage and secondary home page, So
when you launch IE it opens 2 tabs, and users can not change them.
Seems like there are 3 places in GPO to set the homepage, but only one of
them locks them So I have set \windows components\internet explorer\disable
changing home page settings to be the home page I want, that works and lock
the setting for the 1 home page. Then I also set the "disable changing
secondary home page setting" to the 2nd tab I wanted, and this does not work
whe I START IE, but it does work if I'm in IE and hit the home Button. I'm
thinking it is a Bug but maybe I'm doing something wrong..

thanks.