code: def OnSelectCard(self, card):
          
          SimpleSCardAppEventObserver.OnSelectCard(self, card)
          self.feedbacktext.SetLabel('Selected card: ' + repr(card))
          if hasattr(self.selectedcard, 'connection'):
              self.transmitbutton.Enable()
docs: Called when a card is selected by clicking on the
          card or reader tree control or toolbar.