title: How to add menuItem dynamicaly in sherlockaction bar?
body: <p>So I've been working on and Android app that  has a Sherlock action Bar on the top  and that part is working fine but now I want to be able to dynamically add Menu Items to the Sherlock  Action Bar. 
  I have to display log in name on screen if user is log in. 
  Suppose on Activity A I have Log in Button. When that button is clicked then LoginActivity starts. After log in B activity is start. If user pressed back button from activity B then Activity A again starts. But menu items name is not displays. For that I am using onCreateOptionsMenu method.</p>