def on_about(self):
        MessageBox.showinfo("SuperSID", self.controller.about_app())
Voids an existing transaction.
dataset/ETHPy150Open ericgibert/supersid/supersid/tksidviewer.py/tkSidViewer.on_about--crossover with--dataset/ETHPy150Open braintree/braintree_python/braintree/transaction.py/Transaction.void