def METHOD_NAME(self,event):
    if self.scope and 'zs' in dir(self.scope) and self.scope.zs.running:
        #special case for when we are using a wavetable - move whole stack
        self.scope.frameWrangler.stop()
        self.scope.zs.zPoss += self.focusIncrement
        self.scope.frameWrangler.start()
    else:
        try:
            self.piezo[0].MoveRel(self.piezo[1], self.focusIncrement, False)
        except AttributeError:
            if 'lastPos' in dir(self.piezo[0]):
                p = self.piezo[0].lastPos
            else:
                p = self.piezo[0].GetPos(self.piezo[1])
            self.piezo[0].MoveTo(self.piezo[1], p + self.focusIncrement, False)