android - tab.select(); doesn't select my tab -

when press second tab check if internet avaliable, if not selection should return previous tab. i'm using tab.select(); it's not working, me?? don't know if matters, code inside oncreate method.

actionbar actionbar = getactionbar();  actionbar.setdisplayshowtitleenabled(false); actionbar.setdisplayhomeasupenabled(true); actionbar.setnavigationmode(actionbar.navigation_mode_tabs);  final tab myfiles = actionbar.newtab(); myfiles.settext("meus arquivos"); myfiles.settablistener(new tablistener() {      @override     public void ontabunselected(tab tab, fragmenttransaction ft) {         // todo auto-generated method stub     }      @override     public void ontabselected(tab tab, fragmenttransaction ft) {         filesfragment fragment = (filesfragment) getfragmentmanager().findfragmentbyid(r.id.files_frag);         fragment.loadview();     }      @override     public void ontabreselected(tab tab, fragmenttransaction ft) {         // todo auto-generated method stub     } });  actionbar.addtab(myfiles, 0);  tab downloads = actionbar.newtab(); downloads.settext("downloads"); downloads.settablistener(new tablistener() {      @override     public void ontabunselected(tab tab, fragmenttransaction ft) {         // todo auto-generated method stub     }      @override     public void ontabselected(tab tab, fragmenttransaction ft) {         if (androidutil.isnetworkavaliable(getapplicationcontext())) {                  //some code          } else {              log.d(constants.main_view_activity, "----------------");             log.d(constants.main_view_activity, "internet não disponível");             log.d(constants.main_view_activity, "----------------");              dialogsutil                     .showdialogerror(mainviewactivity.this, constants.erro, constants.no_such_internet_found);              myfiles.select();         }      }      @override     public void ontabreselected(tab tab, fragmenttransaction ft) {     } });  actionbar.addtab(downloads, 1);