disable/enable a ribbon button(excel add-in) from a form in C#

[hoadiem]

Hi, everyone

I'm doing an excel add-ins , and let say i have a button in the ribbon. then i add a form to project , i have a button on the form . i want to click on this button to either disable / enable the button in the ribbon.

i made the ribbon button public but can't access it in another form.

any help would be appreciated.

Thanks a lot.