title: xcode: add a second page in a same tab
body: <p>when "Tab A - Page One" satisfies some conditions, it will jump to "Page Two". But "Page Two" must also have a tab view bar at the bottom, and tab bar should shows that Page Two is still in "Tab A".</p>
  
  <p>Page Two is a individual page.</p>
  
  <p>How to do that?...</p>