tkmessagebox askquestion with multiple answers
No, it is not possible with tkMessageBox.
The type option of the Dialog class (used by tkMessageBox) only allows the values abortretryignore, ok, okcancel, retrycancel, yesno, and yesnocancel. You can use these with your Dialog subclasses, but if you want to show more buttons I recommend you to use a Toplevel widget and add them to the window or define your own class.