CPOutlineView Try

/*
 * AppController.j
 * test
 *
 * Created by You on October 2, 2009.
 * Copyright 2009, Your Company All rights reserved.
 */

@import <Foundation/CPObject.j>
@import <AppKit/CPOutlineView.j>

@implementation AppController : CPObject
{
	CPArray items;	
}

- (void)applicationDidFinishLaunching:(CPNotification)aNotification
{
	items = [CPArray array];
	for (var i=0; i< 40; i++) 
	{
		item = [CPString stringWithString:@"Some Text"];
		[items addObject:item];
	}
	
    var theWindow = [[CPWindow alloc] initWithContentRect:CGRectMakeZero() styleMask:CPBorderlessBridgeWindowMask],
        contentView = [theWindow contentView];

	var myView = [[CPOutlineView alloc] initWithFrame:CGRectMake(100,100,400,400)];

	// theController = [[MyController alloc] init];
	[myView setDelegate:self];
	[myView setDataSource:self];
	[contentView addSubview:myView];
    [theWindow orderFront:self];
	console.log(myView);
}
- (id)outlineView:(CPOutlineView)outlineView child:(int)index ofItem:(id)item
{
	return [items objectAtIndex:index];
}

- (BOOL)outlineView:(CPOutlineView)outlineView isItemExpandable:(id)item
{
	return YES;
}

- (int)outlineView:(CPOutlineView)outlineView numberOfChildrenOfItem:(id)item
{
	return 10;
}

- (id)outlineView:(CPOutlineView)outlineView objectValueForTableColumn:(CPTableColumn)tableColumn byItem:(id)item
{
	return [items objectAtIndex:index];
}

@end