Adding an option on the fly (Tkinter)

[Harlin Seritt]

I am making use of a Checkbutton widget. However, I would like to add
an option or method "on the fly." For example I would like to bind a
filename ("filename.txt") to a particular Checkbutton widget so that I
call it later as:

widget["filename"]

Is this possible to do?

Thanks,

Harlin