public PagedViewModel()
 {
     _firstPageVM = new FirstPageViewModel();
     _secondPageVM = new SecondPageViewModel();
     _thirdPageVM = new ThirdPageViewModel();
 }
 public PagedViewModel()
 {
     _firstPageVM  = new FirstPageViewModel();
     _secondPageVM = new SecondPageViewModel();
     _thirdPageVM  = new ThirdPageViewModel();
 }