Is it possible to change the state of a toggleButton on Ribbon at run
time?

I use a custom toggleButton which is always visible to show/hide
another custom Tab on the ribbon. Only authorized users should access
this tab, so the button actually calls a userform requesting a
password. There is no problem when switching from On to Off (hide
tab). But when switching from Off to On (show tab), there are two
cases with a problem:
1. When wrong password is entered.
2. Cancel button is clicked.
I have no problem keeping the custom tab hidden in these 2 cases,
however the button has already changed to On.
In this situation, can I change the pressed state back to Off, or do I
have to tell users that this is 'by design' and to click the button
twice.

Thanks
Dovy