Tabbar application in iphone

hi, i am making an application in which am creating 5 tabbars in iDocViewController view. the problem is that when we are shifting control from disclaimer viewcontroller to idocviewcontroller tabbar. how'll i set focus on idocviewcontroller tabbar. how'll i get rid of this

From stackoverflow

• int desiredTabIndex = // the tab's index within tabBars.viewControllers array tabBar.selectedIndex = desiredTabIndex;