android - Why does my app show the content from the wrong tab? -

i have got problem tabs of app. have got 3 tabs , set second tab 1 shown whenever app started code:

getactionbar().setselectednavigationitem(1); 

after used command app started tab wanted, showed me content of first tab (so content was: tab 2 + overlay content tab1)

after manually switched problematic tab tab whoms content shown , content normal again.

has idea how fix this?

public class tablistener <t extends fragment> implements actionbar.tablistener{      private final activity myactivity;     private final string mytag;     private final class myclass;      public tablistener(activity activity, string tag, class<t> cls) {         myactivity = activity;         mytag = tag;         myclass = cls;     }     @override     public void ontabselected(actionbar.tab tab, fragmenttransaction ft) {          fragment myfragment = myactivity.getfragmentmanager().findfragmentbytag(mytag);          if (myfragment == null) {             myfragment = fragment.instantiate(myactivity, myclass.getname());             ft.add(android.r.id.content, myfragment, mytag);         } else {             ft.attach(myfragment);         }      }      @override     public void ontabunselected(actionbar.tab tab, fragmenttransaction ft) {          fragment myfragment = myactivity.getfragmentmanager().findfragmentbytag(mytag);          if (myfragment != null) {             ft.detach(myfragment);         }      }      @override     public void ontabreselected(actionbar.tab tab, fragmenttransaction ft) {         // todo auto-generated method stub      }      }