DBCHART問題:如何在dbchart的Y軸(縱座標)左右兩邊都可顯示對應值(一個數字,這個百分比)?請大俠們指教

如標題所述:
            50                                        100%
            40                                        80%
(Y軸左顯示) 30                                        60%   (Y軸右顯示)
            20                                        40%
            10                                        20%
            0                                         0% 
               20040810  20040811  20040812  20040813
                       (X軸)