why radiobutton does not deselect itself??

[EdwardT]

hi I have the following code that shows a radiobutton; after I click on it
once it was selected.
atfer I cick on it again, it remains selected, how come?
....
self.type = IntVar()
....

 self.ie = Radiobutton(self.buttonframe,
                text="Build ALL",
                variable=self.type,
                value="MSCALL")

what I am trying to achieve is to give user tow choices, when radio button
is selcted, the operation will go on for all the files, if deselcted, it wil
just bedone on one file ...
if radio buttonis not a good way, any suggestion?

thanks