title: ViewPager: Recursive entry to executePendingTransactions
body: <p>I have a ViewPager within a ViewPager and I am getting this exception</p>
  
  <pre><code>09-07 18:30:26.392: ERROR/AndroidRuntime(841): FATAL EXCEPTION: main
      java.lang.IllegalStateException: Recursive entry to executePendingTransactions
      at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1331)
      at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:422)
      at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:86)
      at android.support.v4.view.ViewPager.populate(ViewPager.java:453)
      at android.support.v4.view.ViewPager.onAttachedToWindow(ViewPager.java:563)
      at android.view.View.dispatchAttachedToWindow(View.java:7974)
      at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1857)
      at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1862)
      at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1862)
      at android.view.ViewGroup.addViewInner(ViewGroup.java:2968)
      at android.view.ViewGroup.addView(ViewGroup.java:2824)
      at android.support.v4.view.ViewPager.addView(ViewPager.java:537)
      at android.view.ViewGroup.addView(ViewGroup.java:2781)
      at android.view.ViewGroup.addView(ViewGroup.java:2761)
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:848)
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1041)
      at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:616)
      at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1359)
      at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:422)
      at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:86)
      at android.support.v4.view.ViewPager.populate(ViewPager.java:453)
      at android.support.v4.view.ViewPager.onAttachedToWindow(ViewPager.java:563)
      at android.view.View.dispatchAttachedToWindow(View.java:7974)
      at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1857)
      at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1862)
      at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1862)
      at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1862)
      at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:1862)
      at android.view.ViewRoot.performTraversals(ViewRoot.java:726)
      at android.view.ViewRoot.handleMessage(ViewRoot.java:1944)
      at android.os.Handler.dispatchMessage(Handler.java:99)
      at android.os.Looper.loop(Looper.java:126)
      at android.app.ActivityThread.main(ActivityThread.java:3997)
      at java.lang.reflect.Method.invokeNative(Native Method)
      at java.lang.reflect.Method.invoke(Method.java:491)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
      at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>I am not really sure where this error comes from and I don't know too much about the FragmentManager.  Do I need to flush the transactions or something like that?  Or is a viewPager within a ViewPager impossible?  And yes I know there are other ways to do this but I want the snappness and the scrolling for free.  Also I would like to understand how it actually works.</p>