如何在flex tabbar中迭代选项卡

I am a flex newbie. I need to disable some of the tabs in a flex tabbar specified, by configuration. I am having trouble in iterating over the tabs in the tab bar. If i use getChildAt() command, it does not disable the tab button, but the content of that tab button, so its no good.I am a flex newbie. I need to disable some of t