Create a tab view item in obj-c for use in applescript studio

Question

I'm making an application with applescript studio. I want to be able to add tab view items to a tab view at the press of a button. The problem I have is applescript studio doesn't allow me to create a new tab view item. So I'm thinking I can create the tab view item using objective-c, pass that to my applescript, then add it to my tab view.
In applescript I plan to use the following call methods to first create the tab view item object, and then add it to my tab view. The objective-c code which is called from the first line in the applescript code is below that. When I run my code I'm getting an error saying newTVI is not defined... so maybe you can see my error! Be kind to me because I'm new to objective-c and I'm sure that's where my problem lies. Anyway, I'd appreciate any help.
==Applescript calls to create and add a new tab view item
set newTVI to call method "returnNewTabViewItem" of class "makeNewTabViewItem"
call method "addTabViewItem:" of objMainTV with parameter newTVI
==Objective-c code to create the tab view item
==makeNewTabViewItem.h==
#import <Cocoa/Cocoa.h>
@interface makeNewTabViewItem : NSTabViewItem
NSTabViewItem *newTVI;
-(NSTabViewItem *)returnNewTabViewItem;
@end
== makeNewTabViewItem.m==
#import "makeNewTabViewItem.h"
@implementation makeNewTabViewItem
-(NSTabViewItem *)returnNewTabViewItem
newTVI = [[[NSTabViewItem alloc] initWithIdentifier:nil] autorelease];
return newTVI;
@end

Answer 1

Please, any ideas?