VBCS: Button set (many) does not support primary button?

Summary

Button set (many) does not support primary button?

Content

Dear all,

 

I've added a Button set Many to my page and two buttons. I've added the class oj-button-primary to one of the buttons. Nothing changes. When I add two other buttons (just normal buttons inside a grid view) and use the oj-button-primary class it DOES work. Do I need to use another class for the Button set Many?

See screenshot.

Regards,

Rick

Version

Autonomous