The NSSharingServicePicker class presents a list of sharing services, so that the user can choose a service to share an item. When a service is chosen, the picker automatically executes it, which presents the sharing window.

+ (NSMenu *)menuForSharingItems:(NSArray *)items
                     withTarget:(id)target //the target to which aSel will be sent to
                       selector:(SEL)aSel    //aSel like: mySelector:(NSMenuItem *)it -> it.representedObject = service according to menu item title.
                serviceDelegate:(id <NSSharingServiceDelegate>)del
{
    NSArray *sharingServices = [NSSharingService sharingServicesForItems:items];
    if (sharingServices.count == 0)
        return nil;
    NSMenu *menu = [[NSMenu alloc] initWithTitle:@"MountainLionSharingMenu"];
    // rebuild the menu
    for (NSSharingService *currentService in sharingServices)
    {
        NSMenuItem *item = [[NSMenuItem alloc] initWithTitle:currentService.title action:aSel keyEquivalent:@""];
        item.image = currentService.image;
        item.representedObject = currentService;
        currentService.delegate = del;
        item.target = target;
        [menu addItem:item];
#if !&#95;&#95;has&#95;feature(objc&#95;arc)
        [item release];
#endif
    }
#if !&#95;&#95;has&#95;feature(objc&#95;arc)
    return [menu autorelease];
#else
    return menu;
#endif
}