i've started a project using the "tab bar application" template. i have got the 2 default included tabs working fine and switching between them works all ok. however, i've add another 2 tabs and created the NIB/XIB files for them and added the 2 buttons for them on the tab bar. but when i cant click on them in the simulator it causes a terminating due to an uncaught exception error. what am i missing to make these 2 new tabs operate correctly ? there is no code in the app yet, this is all just interface work.