TabBarController does not show in iPhone SDK 4.0
I recently upgraded to iPhone SDK 4.0. I realised when following the example in chapter 8 "Creating a Tab Bar Application" (page 186-187), that the Tab Bar Controller does not appear after I double clicked the main.xib file from XCode - as such I'm unable to see the display as on figure 8-4.
Could someone please advise. Thank you.