Illustrator Scripting :: Quick Syntax - Assign Name To UI Elements At Creation

In the extend script documentation it says you can assign a name to UI elements at creation like the example given below
 
dlg.btnPnl.cancelBtn = dlg.btnPnl.add('button', undefined, 'Cancel',
{name:'cancel'});
 
but when i do it like that, the bject's name comes out as undefined when accessed like this
dlg.btnPnl.cancelBtn.name
or like this:
dlg.btnPnl.children['name']
 
but adding the object then naming like this works-
 
dlg.btnPnl.cancelBtn.name = "Cancel";
 
I'm using illustrator cc and the extendscript guide for cs6 (couldn't find a newer one). Did the syntax change?