a question about displaying indictor's result

[FuliangQ]

  hello ,

 first please forgive me for my poor english .

my case is as follows: in an indicator program , i defined a two indicator_type :

#property indicator_type1 DRAW_LINE

#property indicator_type1 DRAW_BAR

so i get two kinds of indicator objects ( line_indicator , bar_indicator) in the chart window when i run the indicator .

But , some time i want to make line_indicator invisible , and in other times i want to make bar_indicator invisible .

SO , what can i do ?

any help will be appreciatred , thanks in advance .