title: How to use hidesBottomBarWhenPushed if i want to hide the tabbar for only one kind of controller?
body: <p>I have gotten in trouble while using hidesBottomBarWhenPushed...
  I will push three controllers – A, B, and C – into navigationcontroller in order, and I would like to hide bottom tab bar when B is shown.(and A is one of the tabbar controllers)</p>
  
  <p>Does any one have ideas?</p>