On May 2, 2014, at 14:06 , Lee Ann Rucker <lruc...@vmware.com> wrote:

> You might find it useful to get one of the Apple sample apps, like 
> TableViewPlayground, and experiment with that - it's easier to figure out 
> what's happening when you have a fully-implemented example than it is to 
> start from scratch.

FWIW, the code being used by the OP has every appearance of being taken from 
this tutorial:

        
https://github.com/lucasderraugh/AppleProg-Cocoa-Tutorials/blob/master/Lesson%2053/Lesson%2053/AppDelegate.m

but it seems to me that the class name ‘DesktopFolderEntity’ suggests an origin 
in a predecessor to the current TableViewPlayground, where there’s currently a 
class name ‘ATDesktopFolderEntity’.

However, now that I look at it, this tutorial seems to be intended to show how 
to use group rows, which isn’t what the OP wants.

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