title: Pop Up Button menu items
body: <p>Okay, I am using Interface Builder in Xcode 4.5.1 and just added a Pop Up Button to the window.  If I click through I see "Item 1", "Item 2", "Item 3", which are editable.  I was expecting to see something in the attributes or identity inspector that let me define how many of these items were in the menu, but there is nothing there.  I've been looking at this for hours.  Where can these be defined?</p>