How to remove scroll bar from Listbox?

Hi,

I am implementing a gui which has a list box. I am scrolling this list using two push buttons (up and down) and selecting the list item using another push button(select).

Initially, I am disabling scrollbar in opening function using these commands:

 % removing vertical scrollbar from listbox(setup_window)
hsetup_window = findobj('-regexp','Tag','setup_window');
jsetup_window = findjobj(hsetup_window);
% VerticalScrollBarPolicy accepts the self-explanatory values of:
% VERTICAL_SCROLLBAR_ALWAYS (=22)
% VERTICAL_SCROLLBAR_NEVER (=21)
% and VERTICAL_SCROLLBAR_AS_NEEDED (=20)
set(jsetup_window,'VerticalScrollBarPolicy',21)

but when I reset the strings in the list box, scrollbar is appearing again.

If I disable it after reset then their is flickering.

I want to remove scrollbar permanently.

Thank you in advance.