Little problem with tabBars inside a project that is not a tabbar project

I'm developing a little app based on a split view controller able to manage several view controller with it respectful navigation bar each one to know where the user is.
Actually in one of this view controllers I'm trying to go to a tabBar view controllor by a buttom, but it is not working well and I don't really know why. I don't have a navigation bar in this tabbarview controller. I'm calling this view when I press the buttom as when I'm calling a normal view controller, in fact, I don't have problems if I want to call a normal view controller.

I think that maybe the problem is that i'm not creating the tabbarview controller in a good handmade way.

Could someone help me? Could you tell me how to create a tabbarviewcontroller manually inside a project (if this is the problem)?

Thanks!!