android - Nested ViewPager not displaying -

i writing application used nested viewpager. every parent viewpager contain 7 child viewpager.

it work first parent, when reached next page show blank @ place of child viewpager.

any suggestion here, if it's feasible use nested view pager even? , if how can avoid case?

parent viewpager layout , same child fragment:

<framelayout                 xmlns:android="http://schemas.android.com/apk/res/android"                 xmlns:customfont="http://schemas.android.com/apk/res-auto"                 android:layout_width="match_parent"                 android:layout_height="match_parent" >                  <android.support.v4.view.viewpager                     android:id="@+id/calendarviewpager"                     android:layout_width="match_parent"                     android:layout_height="match_parent" >                 </android.support.v4.view.viewpager> 

and child viewpager adapter implementation doing parent viewpager fragment:

private void processdatacardadapter(view view) {          childviewpager = (viewpager) view.findviewbyid(r.id.childviewpager);          childslidepageradapter = new childslidepageradapter(parentactivity.getsupportfragmentmanager());          childviewpager.setadapter(childslidepageradapter);          childviewpager.setonpagechangelistener(new viewpager.simpleonpagechangelistener() {             @override             public void onpageselected(int position) {                  utils.showtoast(parentactivity, "sds position : " + position);              }         });     } 

change fragmentmanager work me: change

new childslidepageradapter(parentactivity.getsupportfragmentmanager());

by

new childslidepageradapter(getchildfragmentmanager());