title: How to present a UIViewController with an bottom-up animation without hiding TabBar
body: <p>So, i have a <code>UITabbarController</code> with an <code>UINavigationController</code> in it. On the press of a button, i would like to bring in another <code>UINavigationController</code>, animating it like when using <code>presentModalViewController:animated:</code>, but i do not want it to hide the TabBar.</p>
  
  <p>Is there anything in UIKit (3.1.3 and later) that i could use for this or will i have to do the animating myself?</p>