和NSComBox相比nspopupbutton还是比较简单的，只需要设置titles即可
- (void)viewDidLoad {
[super viewDidLoad];
[groupPB removeAllItems];
[groupPB addItemsWithTitles:[NSArray arrayWithObjects:@"abc",@"cdb",@"13d3d", nil]];
// Do any additional setup after loading the view.
}
//=================================
-(IBAction) groupSelect:(id)sender
{
NSLog(@"%@",[[groupPB selectedItem] title]);
}
