Add a command for when the button is pressed

[Sonic3Modder]

self.about = self.menu.add_cascade("About")

I wanted to add a about menu. but I need a submenu for that. I would like if so you can have a if <button_var_name>.pressed: or a way to assign a function as a command, like customtkinter does, Im hoping you can :D. because. I dont want to add a submenu called "Open About Window"