i tried launching xcode and writing the 'hello world' program. the first thing i did was launch xcode which i have in my dock. i then chose new project from the file menu. i then chose a cocoa application. i then clicked next. and then i wrote the name of the file into the project name field. and then clicked finish. when i double-clicked the mainmenu.nib file according to a book i am reading it is supposed to open up interface builder. when interface builder launches, it shows a blank window, and a mainmenu.nib file, but the cocoa-menus window does not open. in the book it says to click and drag for example, a button. i don't have the button to click and drag. just wondering what is wrong with my version of xcode.