Custom Class Module for multiple UserForm controls?

Hey guys,

I am aware that you can set up custom class modules and use them in situations where you have multiple buttons in a Userform however I can't seem to understand how it works.

As a very simplified version of the situation I am in, lets say I have a Userform with 20 buttons which swap between the captions "+" and "-" each time you click it. Instead of having a click event for each button, i want to has one subroutine where it will check the button that was just clicked and change it's caption if that makes sense. Is this possible?

Additionally, is there a way to create a group of controls in which I can loop through?

Thanks in advance!