Hi Mathieu,
I suppose you have a dropdown with an OptionsGroup as children.
In Java you can get access to that OptionsGroup (it will be a javax.faces.component.UISelectItems).Then you get its value as an array, list or as a BoundPropertiesSelectItemGroupProvider (which in turn has an array/list that you can set) and set its contents with what you wish.
hope this helps,
Javier
p.s.: I don’t go into java details about how this is done cause I suppose you know it already, but let me know if you need an snippet as well.
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