How to find out if an application is marked "Class" in classmates or not?

Question

Classmates

New "Class" button has been added to the OK API. It also indicates how to catch the event in the case of the "Class" mark and perform some action. But the same action must be performed if the "Class" is already marked, for example, after loading the frame with the previously marked button. Is it possible for the OK API to get such information from the side of the frame with the button? If yes, how?