title: call onCreateOptionsMenu in onPostCreate
body: <p>I want to dynamically change the <code>onCreateOptionsMenu</code> items. I have rectified my problem and the only solution is to call <code>onCreateOptionsMenu</code> in <code>onPostCreate</code> but i don't know how to call it. 
  I have already tried my solutions non works. Is it even possible..? </p>