title: getChildFragmentManager() and containerId
body: <p>I create a child fragment in the parent fragment code using getChildFragmentManager(), a containerId, and the method .add(). Then I attempt to replace that childFragment inside the onActivityCreated() method of the childfragment code using childFragmentManager(), that same containerId and .replace() but at this point I get an error saying the fragmentTransaction object or whatever can't find a view for my containerId for fragment "nameofchildfragclass".</p>
  
  <p>I verified that the containerId's in the parent when i create the child and inside the child when i try to replace the child are the same (as they should be).</p>