Updating tabs in tabGroup leading to unexpected behaviour in iOS

Hi, I have a tabGroup with a certain number of tabs when the app starts but later I update the number of tabs in the tabGroup. Clicking on another tab inside this updated tabGroup causes the navigation bar and tab bar to disappear as if the window was in fullscreen mode. I'm updating the tabGroup as follows $.index.tabs = [$.tab1, $.tab2, $.tab3]; Is this a known titanium bug or what is the recommended way to updating tabs inside tabGroup for iOS?