need some help here
My problem is, my app starts with a single view, it shows a menu made with buttons that takes me to different places, one of this places is another kind of menu, but this menu is a tab bar menu, so the thing is, I made a new file with its .xib, I added the tab bar controller, and i Linked all the sections of my tabs with its viewcontrollers...
this means that I have my first menu ready, I have my view controllers ready, I have my menu on the tab bar ready.... 
so my problem is...
how can I go from my single view (the first view that I see and that doesnt include a tab bar), to the new screen with tab bar controller in it after pressing a button???

help me please

Note: I'm using XCode 4.2 and I'm not working with storyboards (requirements of the app)