<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def move_up(self):
 """ Try to select the button above the currently selected one. If a button is not there, wrap down to the bottom of the menu and select the last button. """

        old_index = self.current_index
        self.current_index -= 1
        self.__wrap_index()
        self.__handle_selections(old_index, self.current_index)