EikAppUi() bug

Hi All!
In S60 this line return a correct pointer:
   CEikApplication *app = CEikonEnv::Static()->EikAppUi()->Application() ;

but in S80 this part:
   CEikAppUi*test =CEikonEnv::Static()->EikAppUi();   // test == NULL 

EikAppUi() return a NULL pointer, than I have not acces to:
        CEikApplication *app = CEikonEnv::Static()->EikAppUi()->Application() ;

I need a :    TFileName fullFilename  = CEikonEnv::Static()->EikAppUi()->Application()->AppFullName() ; 

How can I call the AppFullName() in Series80? 
Thanks for any help!

Regards,
              RadeaR