Here is a question one should never have to ask… how do I change the number of rows or columns (more than the one default value) of a radio button in the Xcode interface (i.e., NOT programmatically)?
Amazingly, these controls seem to be missing from the Xcode 7.0 interface.
You’re right. NSMatrix has been dropped in Xcode 7
From the Xcode 7.0 Release Notes
The template for Radio buttons in the Interface Builder object library is now implemented as individual NSButton objects, rather than the older NSMatrix, which is discouraged on OS X v10.8 and later. Radio buttons automatically act as a group (selecting one button will unselect all other related buttons) when they have the same superview and -action method.