Load or unload a ribbon

Hi Gontran
I'm not sure if that is possible. Normally what I do instead is use the GetVisible callback and through that determine if a particular tab, group or button should be visible. Would that work for your scenario?

This not possible in Access. The ribbon is loaded from USysRibbons automatically at program start. You can only modify the visibility of the tabs in the ribbon during runtime.

I assume you want to dynamically change the Ribbon
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/8962f2b5-9b5b-4a4c-a744-dd6cd4988bd8/updating-ribbon-label-at-runtime?forum=exceldev
if you want to "hide it" then

DoCmd.ShowToolbar "Ribbon", acToolbarNo

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to display it again

DoCmd.ShowToolbar "Ribbon", acToolbarYes

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Give some more info on what you want to accomplish and we will try to provide you with some more help

Ok my goal is that I have a Main custom ribbon with buttons with callback function.Some buttons are enabled based on the role of a user.
Sometime I'm doing some impersonation of a specific user to see how my database react. In this case I want to change the user (without closing the app) and after, refresh the ribbon so I can see the difference of the ribbon (some buttons should or should not be enabled.
Thanks

Easy....Ribbon.Invalidate is the key you are looking....
https://sourcedaddy.com/ms-excel/resetting-controls.html

ste5an work fine (thanks by the way!) if at the opening I set the "m_Ribbon" variable by placing my custom ribbon as the default, but the problem I have is if a stop the code (all variable are emptied by vba) then my ribbon variable is lost and I can't reach it.
Is there a way when the database is open and the code as been stop, to reload the ribbon and re-fire the "RibbonOnLoad " function.
thanks

No.

You need the module level variable. Due to VBA, when your module errors out or breaks, then it is lost and you must reload the database file. There is no way around this.