'The key DOWN was pressed.'

def _key_down(self):

    if (not self.all_lines):
        return True
    self.historyCount += 1
    if (self.historyCount >= len(self.all_lines)):
        self.historyCount = (len(self.all_lines) - 1)
    line = self.all_lines[self.historyCount]
    self._showHistory(line)
    return True
