so I had a think:).. if you add your own tabbar control to a view and then setup actions like
- (IBAction)tab1Tapped:(id)sender;
then in the function something like
- (IBAction)tab1Tapped:(id)sender {
UIStoryboard *sb = [UIStoryboard storyboardWithName:@"SToryBoardName" bundle:nil];
UIViewController *vc = [sb instantiateViewControllerWithIdentifier:@"ViewStoryBoardID"];
vc.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentViewController:vc animated:YES completion:nil];
}
then you can display the view modally 
using a main TabBarViewController you create an app like app store where thetas when pressed change the whole window view
Edited by ozie, 30 December 2014 - 08:16 PM.