android - ViewPager's Fragments disappear -

i'm using drawerlayout viewpagerindicator, last won't work correctly drawerlayout. once open application, viewpager displayed correctly once change fragments in drawerlayout viewpager's fragments disappear.

here's fragmentmanager:

fragmentmanager fragmentmanager = getsupportfragmentmanager(); switch (arg2) {     case 0:         contentfragment = new lebanon();         break; }  fragmentmanager.begintransaction()         .replace(r.id.content_frame, contentfragment).commit(); 

the second fragment , fourth in viewpager there , didn't disappear, while first, third , fifth disappear. what's wrong in code?

here's fragment:

@override public view oncreateview(layoutinflater inflater, viewgroup container,         bundle savedinstancestate) {     viewta = inflater.inflate(r.layout.simple_tabs, container, false);     samsunglb = com.androidarabia.lebanon.samsunglb.newinstance();     htclb = com.androidarabia.lebanon.htclb.newinstance();     lglb = com.androidarabia.lebanon.lglb.newinstance();     sonylb = com.androidarabia.lebanon.sonylb.newinstance();     searchlb = com.androidarabia.lebanon.searchlb.newinstance();     this.getsherlockactivity().getsupportactionbar()             .sethomebuttonenabled(true);     prefs = this.getsherlockactivity().getsharedpreferences(prefname,             context.mode_private);     adapter = new googlemusicadapter(this.getsherlockactivity()             .getsupportfragmentmanager());     pager = (viewpager) viewta.findviewbyid(r.id.pager);      pager.setpagetransformer(true, new zoomoutpagetransformer());     indicator = (tabpageindicator) viewta.findviewbyid(r.id.indicator);     pager.setcurrentitem(0);     pager.setadapter(adapter);     pager.setoffscreenpagelimit(4);     indicator.setviewpager(pager);     return viewta; }  private void addtabs(viewpager pager2) {     // todo auto-generated method stub     pager2.setadapter(adapter);     pager2.setoffscreenpagelimit(4);     indicator.setviewpager(pager); }  class googlemusicadapter extends fragmentstatepageradapter {      public googlemusicadapter(fragmentmanager fm) {         super(fm);         notifydatasetchanged();     }      @override     public fragment getitem(int position) {          switch (position) {         case 0:             return samsunglb;         case 1:             return htclb;         case 2:             return lglb;         case 3:             return sonylb;         case 4:             return searchlb;          }         notifydatasetchanged();          return testfragment.newinstance(content[position % content.length]);     }      @override     public charsequence getpagetitle(int position) {          return content[position % content.length].touppercase();     }      @override     public int getcount() {          return content.length;     }  } 

use getchildfragmentmanager() googlemusicadapter:

adapter = new googlemusicadapter(getchildfragmentmanager()); 

because fragments used viewpager nested fragments.